Petroleum Development Oman L.L.C.
Document title: SP-1281
Engineering Specification for Safe Road Works
Document ID
Document Type
Security
Discipline
Owner
Issue Date
Version
SP-1281
Specification
Restricted
Civil Engineering
Hilal Said Al Aghbari UEP1C – CFDH Civil Engineering
July 2017
3.0
Keywords: This document is the property of Petroleum Development Oman, LLC. Neither the whole
nor any part of this document may be disclosed to others or reproduced, stored in a retrieval system,
or transmitted in any form by any means (electronic, mechanical, reprographic recording or otherwise)
without prior written consent of the owner.
Petroleum Development Oman LLC
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i
Version: 3.0
Effective: July-17
Document Authorisation
Authorised For Issue
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ii Revision History
The following is a brief summary of the most recent revisions to this document. Details
of all revisions prior to these are held on file by the issuing department.
Version No
Page 4
Date
Author
Scope / Remarks
Revision 0
Nov ‘94
BEZ/5
First issue as PDO-ERD-17-08.
Version 1.0
Dec ‘04
Ali Nasser Al Jahadhamy,
TTO/2 (UEC)
Version 2.0
Dec ‘09
Ali Nasser Al Jahadhamy,
UIB/4 (UEC)
Converted to specification as per
PDO policy and minor changes to
the text.
Specification updated.
Version 3.0
July ‘17
Hilal Said Al Aghbari,
UEP1C (UEB)
Generally revised and updated the
standards.
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iii Related Business Processes
Code
Page 5
Business Process (EPBM 4.0)
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iv Related Corporate Management Frame Work (CMF)
Documents
The related CMF Documents can be retrieved from the Corporate Business Control
Documentation Register CMF.
Code
GU-611
Revision 23a
Page 6
Corporate Management Frame Work (CMF) Documents
PDO Engineering Standards and Procedures
Engineering Specification for ‘Safe Road Works’
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TABLE OF CONTENTS
i
Document Authorisation ...................................................................................................... 3
ii
Revision History................................................................................................................... 4
iii
Related Business Processes .............................................................................................. 5
iv
Related Corporate Management Frame Work (CMF) Documents ..................................... 6
1
Introduction ........................................................................................................................ 10
1.1
Purpose ....................................................................................................................... 10
1.2
Scope ........................................................................................................................... 10
1.3
Target Audience, Distribution & Further Copies ......................................................... 10
1.4
User Guidelines ........................................................................................................... 10
1.5
Changes to the Specification ...................................................................................... 11
1.6
Order of precedence .................................................................................................... 11
1.7
Units of measurement ................................................................................................. 11
1.8
Applicable Standards, Specifications and Codes ....................................................... 11
1.8.1
PDO Standards .......................................................................................... 12
1.8.2
Omani Standards ....................................................................................... 12
1.8.3
International Standards.............................................................................. 12
1.9
2
Step-out and Approval ................................................................................................. 12
Scope................................................................................................................................. 13
2.1
General ........................................................................................................................ 13
2.2
Basic Requirements for Safe Road Works ................................................................. 13
2.2.1
Working space ........................................................................................... 13
2.2.2
Safety zone ................................................................................................ 13
2.3
Principles ..................................................................................................................... 14
2.3.1
Planning ..................................................................................................... 14
2.3.2
Personnel Visibility..................................................................................... 14
2.3.3
Vehicle Visibility ......................................................................................... 14
2.3.4
Sign Fixing ................................................................................................. 14
2.3.5
Sign Visibility .............................................................................................. 14
2.3.6
Signs On 2-Way Roads ............................................................................. 14
2.3.7
Surplus Signs ............................................................................................. 14
2.4
Basic Signs & Equipment ............................................................................................ 15
2.4.1
Advance Signs ........................................................................................... 15
2.4.2
Cones & Lamps ......................................................................................... 15
2.4.3
Keep Right & Keep Left Signs ................................................................... 15
2.4.4
Traffic Barrier ............................................................................................. 16
2.4.5
Pedestrian Barriers .................................................................................... 16
2.4.6
Tape Barriers ............................................................................................. 16
2.4.7
Additional Areas Requiring Signs .............................................................. 16
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2.4.8
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Effective: July-17
End Signs .................................................................................................. 16
2.5
Additional Requirements ............................................................................................ 17
2.6
Sign Lighting & Reflectorisation ................................................................................. 17
2.6.1
Sign Lighting ............................................................................................. 17
2.6.2
Reflectorisation ......................................................................................... 17
2.6.3
Stop/Go Boards ........................................................................................ 18
2.7
Situations Requiring Clarification ............................................................................... 18
2.8
Signing for Pedestrian & Vehicular Traffic ................................................................. 18
2.8.1
Parking ...................................................................................................... 18
2.8.2
Advance Signing ....................................................................................... 18
2.8.3
Access to the Work Site ........................................................................... 19
2.9
Traffic Control ............................................................................................................. 19
2.9.1
Reduced Road Widths .............................................................................. 19
2.9.2
Type of Control .......................................................................................... 19
2.9.3
Traffic Control by 'Give & Take' System ................................................... 19
2.9.4
Traffic Control by Priority Signs ................................................................ 19
2.9.5
Traffic Control by Stop/Go Boards ............................................................ 20
2.9.6
Traffic may be controlled manually using Stop/Go Boards ...................... 20
2.9.7
Traffic Control by Portable Traffic Signals ................................................ 20
2.10
Works on Footways Alternative ................................................................ 21
2.10.1
Alternative Ways for Pedestrians ............................................................. 21
2.10.2
Pedestrian Safety ...................................................................................... 21
2.10.3
Barriers ...................................................................................................... 21
2.10.4
Deep Excavations ..................................................................................... 21
2.10.5
Safety Zones for Works on Footways ....................................................... 21
2.11
Works on 2-Lane Single Carriageway Roads .......................................... 21
2.11.1
Parked Vehicle .......................................................................................... 22
2.11.2
Reduced Road Widths .............................................................................. 22
2.11.3
Setting out Works for Two Lane Carriage Way ........................................ 22
2.12
Works at Pedestrian Crossings ................................................................ 22
2.13
Work at Road Junctions ........................................................................... 23
2.14
Works at Permanent Traffic Signalled Road Junctions ........................... 23
2.14.1
Approaches to the Traffic Signalled Road Junctions ............................... 23
2.14.2
Works at Traffic Signals ............................................................................ 23
2.15
Works at Roundabouts ............................................................................. 23
2.15.1
Entrances & Exits of Roundabouts ........................................................... 23
2.15.2
Circulatory Areas of Roundabouts ............................................................ 24
2.16
Mobile Works on Blacktop Roads ............................................................ 24
2.17
Mobile Works on Graded Roads .............................................................. 25
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2.17.1
Re-grading Works on Graded Roads ........................................................ 25
2.17.2
Re-sheeting Works on Graded Roads ...................................................... 27
2.17.3
Other Mobil Road Works on Graded Roads ............................................. 28
2.18
3
Version: 3.0
Effective: July-17
Check List .................................................................................................. 28
2.18.1
Check List - Before Starting Work ............................................................. 28
2.18.2
Check List - When Work is in Progress .................................................... 29
2.18.3
Check List - When Work is Complete ....................................................... 30
Appendix ............................................................................................................................ 31
3.1
Appendix A: Glossary of Definitions & Abbreviations ................................................. 32
3.1.1
A.1: General Definitions & Terminology .................................................... 32
3.1.2
A.2: Site Layout Definitions ....................................................................... 33
3.1.3
A.3: Abbreviations ...................................................................................... 33
3.2
Appendix B: List of Tables ........................................................................................... 34
3.3
Appendix C: Signs, Signboards, Equipments & Layout for Road Works ................... 36
3.3.1
C.1: List of Figures for Basic Signs & Signboards for Road Works .......... 36
3.3.2
C.2: List of Figures for Signs & Layout Drawings for Various Road Works
40
3.4
Page 9
Appendix D: SP User - Comment Form ...................................................................... 59
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1 Introduction
1.1
Purpose
This specification illustrates the minimum requirements and recommendations for the
‘safe road works’ of the Company’s infrastructure works.
This specification is intended to:
1.2
-
Detail the engineering specification for all types of road works signs.
-
Set out the safe road works
-
Set the Company standards for facilities along the facilities life cycle.
-
Disseminate and record facilities related information, experience and
procedures.
Scope
This specification is applicable for the construction, maintenance and operations of the
Company’s civil infrastructure works. This document is applicable for the use of
Company’s Oil and Gas and Real Estate facilities.
1.3
Target Audience, Distribution & Further Copies
This specification is intended for the use of PDO personnel and its nominated
Consultants and Contractors.
This document will be distributed and archived electronically within Company’s live
link. Latest version of this document will be available in the Company’s CMF portal.
1.4
User Guidelines
This Specification supersedes the SP-1281 Version 2.0 “Engineering Specification
for Safe Road Works”. Other than the conversion or formatting, the following are the
main changes to this document.
-
Applicable Standards, Specifications and Codes are revised.
-
Section numbers, headings and content of sections altered.
This document gives only the engineering specifications and requirements for the
signing and guarding of all types of road works for the current speed restriction of 80
km/h roads.
For the speed over 80 km/h roads (e.g., primary & secondary types of asphalt roads),
the User shall refer to Oman Highway Design Standards and other appropriate
international standards are listed in section 1.7.
This document does not cover every situation that may occur, but most of the common
ones are shown. Signs, equipments layout and details shown in this document are the
latest at the time of preparation. It is the responsibility of the user to verify and obtain
the latest Signs & equipment layout details from the Company.
For additional signs and signboard requirements, the User shall refer SP-1284,
Specification for Signs & Signs Boards – Standard Signs Catalogue.
For all HSE requirements, the User shall refer the CP-122 ‘Code of Practice for Health,
Safety and Environmental Protection’ and other documents referenced therein.
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The User should consult the Company Site Representative if there is any doubt about
the correct procedure and further requirements if any.
1.5
Changes to the Specification
Owner of this document is the Corporate Functional Discipline Head (CFDH) of Civil
Engineering. Reviews, modifications or changes to this specification will normally be
made by the CFDH every four years once or earlier when justified. Any User of this
document, who encounters an inaccuracy or ambiguity, is requested to notify the
CFDH using the SP user-comment form provided in Appendix-D.
1.6
Order of precedence
All works shall be carried out in accordance with the Codes and Standards as
specified in the guideline. The order of precedence shall be as follows:
1.7

Royal Decrees, Local Government Acts and Regulations

Project Specific procedures, instructions

Codes of Practices (CP)

Company Specifications (SP)

Company Procedures (PR)

Guidelines (GUs)

Design and Engineering Practice (DEP)

International Codes and Standards

Good engineering practices
Units of measurement
In general, SI Units of measurement shall apply for all works. The main symbols
should be used are given below. The same symbol should be used for singular and
plural values. No full stops or other punctuation marks should be used after the
symbol unless it occurs at the end of the sentence.
A single space should separate figures from symbols. In addition, the following are
used in this document.
Quantity
1.8
Description
Symbol
Dimensions
:
millimetre
mm
Distances
:
metre, kilometre
m, km
Speed
:
kilometres per hour
km/h
Applicable Standards, Specifications and Codes
This specification shall be used in conjunction with the latest revisions of the following
Standards, Specifications and Codes.
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1.8.1
PDO Standards
1.8.2
SP-1279
:
Specification for Civil & Building Construction
SP-1285
:
Specification for Civil & Building’s Utility Services
SP-1284
:
Specification for Signs & Signboards – Standard Signs Catalogue
AVME List
:
Approved Vendors for Materials & Equipments List
Omani Standards
1.8.3
Highway Design Standards 2010:
Volume 1 & 2.
Ministry of
Communications - Sultanate of
Oman. Version
:
Technical advice and guideline
Highway design and standards
Highway Design Standards 2010 :
Volume
3.
Ministry
of
Communications – S O Oman.
:
Standard Specification for Road & Bridge
Construction.
Dept. of Inspection, Street Naming
&
Property
Numbering.
Directorate General of Technical
Affairs,
Capital
Municipality,
Sultanate of Oman.
:
Street Name Signs
Royal Oman Police
:
Bye-Laws & Ordinances
for
International Standards
Safer Road Works Ahead
:
Road works Layout
Dept of Transport, UK - Design manual for
roads and bridges Volume 8
GCC manual on uniform
devices Part 5 - 2004.
Road works layout
1.9
Version: 3.0
Effective: July-17
:
traffic
control
US manual on uniform traffic control devices
Part 6 -2003
Step-out and Approval
Any deviation from this part of specification shall be subject to the Company’s approval
and shall be addressed in writing to the CFDH through live link by using the variance
tool or any other appropriate system which is applicable. In all cases, the Company
determine the adequacy of the design carried out and works executed by the
Contractor in accordance with this Specifications.
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2 Scope
2.1
General
Road works are necessary from time to time, either to maintain or modify the road
network. This document gives engineering specifications for the safe road works,
signing and guarding of all types of PDO roads. It is a requirement that appropriate
signs and markings shall be installed on roads, whether the road works is small or big,
so that the users of the road are fully informed of the works ahead.
The responsibility for the design of temporary traffic management should be clearly
defined in the contract documents. Any road repair or construction, the supervisors
and their workers have an important responsibility to ensure that all road works are
safe and that drivers and pedestrians are well informed in advance about the size and
nature of any obstruction.
2.2
Basic Requirements for Safe Road Works
2.2.1
Working space
Contractor shall ensure that enough working space is available at the works area
(see Appendix A for definitions) for the movement and operation of the plant (e.g.,
swinging of jibs and excavator arms) is clear of passing traffic and is not encroaching
into the safety zone. It must be remembered that safety is a mandatory requirement
not an option. The design process for the temporary traffic management shall follow
as per the section 20.4 & 20.5 of the Oman Highway Design Standards 2010.
2.2.2
Safety zone
The area to be marked of with cones shall include the works area, working space
and safety zone. The safety zone shall comprise the following:
1. The length of the lead-in taper of cones (T): varies with the speed limit and the
width of the works as given in Table 3.
2. The long ways clearance (L): the length between the end of the lead-in taper
off cones (T) and the working space (L) varies with the speed limit as given in
Table 1 and Figures 6 & 7.
3. The sideways clearance (S): the width between the working, space and
moving traffic. (S) Varies with the speed limit as given Table 1 and Figures 6
& 7.
Working space and safety zones shall be provided when personnel are present, but
may be reduced in size when the site becomes unoccupied to give less obstruction
to traffic. However, if pedestrians are diverted into the carriageway, a safety zone
shall be provided at all times between the pedestrian barrier and the line of cones for
traffic.
The safety zone shall not be used as a work area or for storing plant or materials.
Contractor shall ensure that their Workers shall not enter the safety zone in the
normal course of work. Materials and equipment shall not be placed in the safety
zone.
Workers should only need to enter the zone to maintain cones and other road signs.
Figure 6 and 7 (refer Appendix C) together with Table 1 (refer Appendix B) gives:

Page 13
The minimum dimensions of the safety zones.
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
2.3
Version: 3.0
Effective: July-17
The arrangement of the works area, working space and safety zone for a
typical site.
Principles
2.3.1
Planning
It is the responsibility of road workers and their supervisors to fully sign and guard
road works safely. Time should be taken to plan how work will be done and the
equipment required to achieve maximum safety for both road workers and users.
2.3.2
Personnel Visibility
Whether working on-site or only visiting the Works, personnel should wear a highVisibility jacket, and shall wear safety boots and helmet at all times. In addition, other
protective clothing / equipment, may be needed (goggles etc.).
2.3.3
Vehicle Visibility
The works vehicle being used to store and deliver the Road Works Signs, should be
painted in a conspicuous colour of high Visibility, and shall be fitted with a roofmounted amber beacon.
2.3.4
Sign Fixing
Sacks of sand (or similar) shall be used to secure the signs and guarding equipment,
so that they cannot be blown over or dislodged by passing traffic. Kerbstones,
stones, concrete blocks or other similar weights shall not be used for this purpose
since they may be dangerous if hit by moving traffic.
The first sign shall be placed far enough away from the Works, given as distance (D)
in Table 3 (Refer appendix B) to give adequate early warning of the roadwork hazard.
Only approved signs shall be used and shall be placed correctly. Signs shall be
checked regularly for position, damage or dirt.
In cases where the road works make it impossible for drivers to follow permanent
traffic signs, formal notification to the Company Site Representative is necessary, as
such signs may well need to be covered.
2.3.5
Sign Visibility
Some signs being required reflected type and adequately lit after dark (refer section
2.6).
The Company Site Representative shall be consulted at times of poor visibility or bad
weather as additional signs, or the suspension of the work, may be required.
2.3.6
Signs On 2-Way Roads
On a 2-way road, the signs should be set out for traffic in both directions.
2.3.7
Surplus Signs
Signs or guarding equipment no longer required either during, or on completion of
the work, shall be removed immediately.
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2.4
Version: 3.0
Effective: July-17
Basic Signs & Equipment
Whether the works are small or large, on the ground or overhead, lasting hours or
months, all road works shall give the same basic warning and information (see figure 1
and 4 in Appendix C.
Note:
1. For any additional signs, safe guarding requirements, proposed speed limits at
the road works zones, user should consult with ROP and PDO roads safety
representatives and comply the requirements before to execute the works.
2.4.1
Advance Signs
The “Road works ahead” sign is the first sign to be seen by the
driver, and therefore shall be placed well before the works. Size
and minimum distance from the works will vary with the type of
road and speed limit (see table 3 in Appendix B). A range of
distance is given to allow the sign to be placed in the most
convenient position with regard to available space and visibility
for drivers.
The “Carriageway Narrows ahead” sign warns drivers which side
of the carriageway is obstructed and shall be located midway
between the first sign and the beginning of the taper of cones
guarding the Works.
2.4.2
Cones & Lamps
A line of Traffic Cones (coloured with red and white strips) shall
be provided to guide traffic past the Works and Road Danger
Lamps shall be provided at night in poor daytime visibility and
bad weather. Details of the location and spacing of signs, cones
and lamps are given in Table 3. Refer Appendix B.
Road Danger Lamps shall not be higher than 1.2m above the
road. Road Danger Lamps shall be used under the conditions
given in Table 4. Refer Appendix B.
Note: Wooden Posts or any other suitable supports shall be used
to elevate the Road Danger Lamps.
2.4.3
Keep Right & Keep Left Signs
Keep left or, if appropriate, Keep Right signs, of
the same size as the Road Works advance
warning sign, shall be provided at the beginning
and end of the in taper of cones.
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2.4.4
Traffic Barrier
A Traffic Barrier (coloured with red and white
strips) shall be provided at the end of the lead-in
taper, within the corned-off area, to indicate the
width of the works site. The barrier shall face
oncoming traffic. A barrier is not required if a
conspicuous vehicle is present (see Figure 7).
2.4.5
Version: 3.0
Effective: July-17
Min 900 mm
Pedestrian Barriers
Excavations shall be fenced-off, using Pedestrian
Barriers (coloured with red and white strips), along
the sides where pedestrians would normally have
access allowing sufficient clearance to prevent
them falling into the hole. Barriers shall be located
so that they cannot be knocked over. With long
excavations, several properly supported posts
(which can be made of timber) shall be linked
together to form a continuous barrier.
2.4.6
Tape Barriers
Red and white tape barriers, with independent free
standing supports, may be used in addition to, but
not instead of Traffic and Pedestrian Barriers to
complete the isolation of the working space around
the works.
Alternatively, metal stakes (rebar or similar) may
be utilised by hammering into the ground, however
they are only acceptable if the top end is properly
machine bent (in a complete loop) to avoid sharp
edges.
2.4.7
Additional Areas Requiring Signs
Other obstructions, e.g. spoil, plant and pedestrian footways, which are not already
within the working space, shall be signed and guarded separately with tape barriers.
2.4.8
End Signs
An “end of road works” sign shall be provide beyond the road
works, or beyond two or more consecutive Road Work sites
grouped together.
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2.5
Version: 3.0
Effective: July-17
Additional Requirements
Additional signing, guarding and traffic control equipment may be required because of
the location and nature of the work.
Warning signs may have to be duplicated on both sides of the road, e.g. where the
signs on the right-hand side may be blocked out by heavy traffic.
Signs used on an illuminated road that has a speed limit of 50km/h or more shall be
directly illuminated when the street lighting is switched on (see figure 5).
The road width and traffic volume at the work site may require traffic control (see
Section 2.9 on this document).
2.6
Sign Lighting & Reflectorisation
2.6.1
Sign Lighting
The sign shown in figure 5 and any plates used with them shall be directly illuminated
at night when all of the following conditions apply:
-
The speed limit is 50km/h or more
-
There is street lighting and this street lighting is illuminated
-
The sign is within 50 m of a street light.
Figure 5 – Sign Illumination
2.6.2
Reflectorisation
The sign shown in figure 5 and any plates used with them, do not require direct light
at night if any of the conditions given in Section 2.6.1 above do not apply and the
signs are reflectorised.
All other signs and places used at night, except the Direction of Temporary
Pedestrian Route sign and Information Boards shall be reflectorised.
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2.6.3
Version: 3.0
Effective: July-17
Stop/Go Boards
Stop/Go Boards (shown in Figure 2) shall be directly lit at night.
2.7
Situations Requiring Clarification
1. Supervisors shall always consult the Company’s Site Representative,
-
Either - when a works situation arises which is not covered in this guideline,
-
Or - when clarification of the correct procedure is required.
Problem areas might include:
2.8
-
Where the Company or ROP restricts work to certain times of the day.
-
When the Works make it impossible for drivers to follow the permanent traffic
signs.
-
At times of poor visibility or bad weather conditions when additional signs
may be required or the work suspended.
-
When stronger than normal barriers are required (excavations > 1.2 in).
-
Whether traffic control is required and the type appropriate.
-
When tailbacks occur at portable traffic signals.
-
Where a width of at least 3.25 in cannot be provided.
-
When the road works affect a pedestrian crossing and the crossing has to be
taken out of action by the Company or ROP.
-
Where it may be necessary to close a road and therefore provide a diversion
route other than that shown in Figures 21 & 22 for re-grading and re-sheeting
of graded roads.
-
Works at roundabouts.
-
Works near the junction of roads joining and leaving high-speed roads.
-
Works near to areas with children.
Signing for Pedestrian & Vehicular Traffic
2.8.1
Parking
The vehicle delivering the road signs shall be parked safely before signs are
unloaded or set up. In cases where off the road parking is not available, the vehicle
shall be located so as to be seen clearly by other drivers, first of all by switching on
roof-mounted amber beacon.
If possible, signs shall be placed so as not to obstruct vehicles or pedestrians. In
cases where there is no street lighting, a Road Danger Lamp should be placed
alongside signs, which are on, or partly on, a footway to warn pedestrians at night.
2.8.2
Advance Signing
The distances for the advance signs shall be selected from Table 3. In cases where
there is limited visibility on the approach to the proposed works site, e.g. on a sharp
bend, dip in the road or on the brow of a hill, extra advance signs shall be provided,
and shall be placed as a first step.
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2.8.3
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Access to the Work Site
When setting out the signing and coning, provision shall be made for receiving
deliveries, supervisor’s vehicles, etc. The coned-off area may need to be larger than
would be required for the Works alone. Entrances and exits from and to the road
may have to be provided.
Vehicle roof-mounted amber beacons shall be switched on before signalling to enter
the Works to ensure that other drivers will not be misled into entering the coned-off
area. Hazard warning lights shall not be used when entering or leaving a site as they
may confuse other road users.
2.9
Traffic Control
2.9.1
Reduced Road Widths
Reduced Road widths when passing the Works (W) shall be as shown in Table 2. In
cases where the minimum width for 2-way traffic is not available, the cones shall be
placed to reduce the carriageway for 1-way traffic and control provided.
2.9.2
Type of Control
Supervisors shall establish if and what type of traffic control is required.
Requirements shall be based on:
-
The road width available, and whether any further reductions can be made to
the widths given above.
-
The traffic volume.
-
Whether or not drivers can see oncoming traffic beyond the Works.
Traffic Control with Flags shall be avoided with its use only permitted in emergencies.
Arm movements shall not be used at any time.
2.9.3
Traffic Control by 'Give & Take' System
The 'Give & Take' system (where vehicles take it in turn to pass the road works on
the basis of courtesy) shall only be used when the work is taking place on a road
where any of the following apply:
-
there is a total 2-way traffic flow of less than 15 vehicles counted over 3
minutes (300 vehicles per hour),
-
less than 15 heavy goods vehicles pass the Works site per hour the speed
limit is 50 km/h or under,
-
the length of the Works from the start of the lead-in taper to the end of the
exit taper is not more than 40 m.
-
Drivers approaching from either direction can see both ends of the site.
For Layout details see Figure 9 in Appendix C.
2.9.4
Traffic Control by Priority Signs
Priority Signs should be used when:
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The two-way traffic flow is less than 30 vehicles counted
over 3 minutes (600 vehicles per hour).
The length of the works from the start of the lead-in taper
to the end of the exit taper is 80m or less,
Drivers approaching from either direction can see through the site from a point 50m
before the coned off area to a point 50m beyond the end of the coning
Priority should be given to:
Either – Vehicles in the un-obstructed lane, which goes past the works, Or – Vehicles
going up a steep gradient.
The priority signs shall be faced in opposite directions. For the layout details see
Figure 10 in Appendix C.
2.9.5
Traffic Control by Stop/Go Boards
For Layout details see Figure 11 in Appendix C.
2.9.6
Traffic may be controlled manually using Stop/Go Boards
Stop/Go Boards shall be operated at the both ends of the works, unless the lane
passing the road works is less than 20m long and is straight, in which case only a
single Stop/Go Board is required, operating at one end or in the middle. 2-way radios
may be required to help with traffic control.
The operator showing Go to traffic should change the direction of traffic flow by
reversing the board to show Stop. Adequate time for clearance of vehicles in the lane
passing the road works should be allowed before the other board is reversed to show
Go.
2.9.7
Traffic Control by Portable Traffic Signals
Portable Traffic Signals may be used for traffic control at most sites, which have a
length of 300 in or less. However, it should be ensured that the exit from the
restricted length of road does not become blocked, resulting in tailbacks stopping
traffic travelling in the opposite direction from moving when the lights change to
green. Traffic control of greater than 300 m require road closure and separate
diversions, detours, etc.,
The use of Portable Traffic Signals is subject to Company’s Site Representative
approval (who shall seek advice from the Company Road Safety Focal Point).
Traffic signal timings shall be correctly set up to correspond to the length of the
Works.
Stop/Go boards shall be made available in case the Portable Traffic Signals break
down. For the layout details see Figure 12 in Appendix C.
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2.10 Works on Footways Alternative
2.10.1
Alternative Ways for Pedestrians
In cases where a footway or part of a footway is closed, an alternative safe route for
pedestrians shall be provided. Additional equipment may be required. Pedestrian
access to facilities shall always be provided. Temporary Pedestrian ways should not
be less than 1m wide and, where possible, should be 1.5m or wider.
Pedestrians shall not be diverted onto an unguarded carriageway. If the temporary
footway is in the carriageway, the approach shall be guarded and signed. A typical
layout is shown on Figure 13.
Note: Signs and guards shall be placed before the footway is blocked.
2.10.2
Pedestrian Safety
No danger to pedestrians, from falling objects, falling over or bumping into anything,
shall be ensured. Scaffolding shall be marked with white bands at eye level and a
minimum of 2.1 m headroom allowed. Kerb ramps or raised footways shall be
provided.
2.10.3
Barriers
Pedestrian Barriers shall be used to mark out temporary footways. Rigid barriers
shall be used to protect pedestrians from traffic, excavations, plant or materials.
Road Danger Lamps shall be provided at the ends of the barriers at night.
Pedestrian Barriers should have:
-
hand rails between 1.0 and 1.2m above ground level.
-
tapping rails fixed with the lower edge, approximately 150mm above the
ground.
In cases where covers are to be removed from constantly attended underground
chambers or manholes, barriers with a handrail fixed no lower than 0.8m above
ground level may be used. In this case, the barrier shall be large enough to enclose
the opening and cover.
Tape Barriers may be used in areas other than the above.
2.10.4
Deep Excavations
For excavations deeper than 1.2m stronger barriers shall be provided.
2.10.5
Safety Zones for Works on Footways
In cases where the works are closer to the kerb than the width of the Sideways
Clearance (S), given in Section 2.2.2 of this document, a safety zone shall be
provided in the carriageway. Figure 8 gives guidance on the approach to signing and
guarding of the Safety Zone.
2.11 Works on 2-Lane Single Carriageway Roads
The basic layout shown on Figure 4 should be used for the approach signing and
guarding except in cases where:
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There is a conspicuous vehicle on the approach to the Works. The vehicle shall be
visible to drivers for a minimum of 25m. In this case, a Traffic Barrier is only required to
protect pedestrians.
-
there is a conspicuous vehicle, with a roof-mounted beacon in continuous use
at Works on a road where:
-
there is a total 2-way traffic flow of less than 15 vehicles counted over 3
minutes (300 vehicles per hour),
-
less than 15 heavy goods vehicles pass the works site per hour,
-
the speed limit is 50 km/h or under.
In this case, as long as drivers can see the beacon clearly from at least 50m in either
direction, the Road Works ahead and Road Narrows signs are not required in advance
of the Works. However, the taper of traffic cones and the Keep Left/Right signs are still
required.
2.11.1
Parked Vehicle
In cases where a vehicle is parked in front of the Works to give some physical
protection, a minimum distance of 5m shall be provided between the vehicle and the
working space.
The Long-ways Clearance (L) shall be measured from the end of the leading-taper to
the part of the vehicle which faces the traffic. The vehicle should be parked so the
back is facing the Works.
2.11.2
Reduced Road Widths
Minimum road widths and traffic control shall be as given in Table 2.
The Company Site Representative shall be consulted if a Width of at least 3.25m on
both sides of a site, which is in the middle of a road, cannot be provided.
It may be possible to reduce the traffic lanes to a width of 3.0m or to close one side
completely and set-up traffic control on the other side.
2.11.3
Setting out Works for Two Lane Carriage Way
A typical layout, including signing, for works with conspicuous vehicle on the side of
2-lane carriageway is shown on Figure 15. Similarly, a typical layout for works in the
centre of a 2-lane carriageway is shown Figure 16.
2.12 Works at Pedestrian Crossings
In cases where a pedestrian crossing cannot be used, or where the studs and/or
stripes have been removed or blocked, the crossing shall be made inoperable by:
-
Providing barriers across pedestrian accesses to the crossing.
-
Providing signs showing Crossing Not In Use located so as to face
pedestrian on both sides of the road.
-
Switching off the light signals, if any, and providing Traffic Signal Failure
signs in the direction of approaching traffic.
-
Extinguishing or covering ‘Zebra’ crossing globes.
In case where the Works spread into one or both sides of a double crossing which has
a central refuge, both crossings shall be closed. For the Layout details see Figure 17
in Appendix C.
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2.13 Work at Road Junctions
2-way traffic shall be kept flowing past the works, if possible. If not possible, then a
diversion route may be required.
In cases where the works are on a side road, Road Works signs
with arrow plates shall be provided on the main road. Figure 18
shows a typical layout.
Figure 19 shows a typical layout for Works on or near the far side
of a junction. In this case, the taper of cones should be taken up to
the approach side of the junction. Cones near the junction mouth
should ensure that drivers turn right smoothly.
2.14 Works at Permanent Traffic Signalled Road Junctions
2.14.1
Approaches to the Traffic Signalled Road Junctions
A works site on the approach to a ‘traffic signalled junction’ can cause significant
disruption to the traffic flow at the junction.
In such cases, the Company Site Representative shall be consulted, as an
adjustment to the timing of the traffic signals may be required.
2.14.2
Works at Traffic Signals
In cases where traffic signals are being used but they are not operating, Failure of
Traffic Signals signs shall be provided on all approaches.
Figure 20 shows the guarding and signing for Works where signals are on allpurpose, single carriageway, urban roads with a 50-km/h or less speed limit.
Figure 20A
Work at an island signal when there is no works vehicle
present
Figure 20B
Work at an island signal where a conspicuously coloured
vehicle, with operating roof-mounted beacon, can be seen
clearly
Figure 20C
Work at a kerbside signal where a conspicuously coloured
vehicle, with operating roof-mounted beacon, can be seen
clearly
2.15 Works at Roundabouts
Works at or near roundabouts can only take place after a lot of preplanning and liaison
with the Company Site Representative (who shall seek advice from road Safety Focal
Point).
2.15.1
Entrances & Exits of Roundabouts
2-way traffic shall be kept flowing past the Works if possible. If this is not possible,
the Company Site Representative shall be consulted, as a diversion route may be
required.
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2.15.2
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Circulatory Areas of Roundabouts
Traffic should be kept moving.
If this is not possible, the Company Site
Representative shall be consulted, as a diversion route may be required.
For emergency works, the Company Site Representative shall be informed.
2.16 Mobile Works on Blacktop Roads
Mobile works include:
-
continuous mobile operations.
-
operations which involve movement and periodic stops and short duration
static works.
-
minor works, often on utilities and building services, carried out from a single
vehicle or a small number of vehicles.
Work shall be carried out when there is good visibility and during periods of low risk.
The Company Site Representative shall be informed in cases where work is to take
place in the centre of the carriageway and the traffic has to pass on either side of the
vehicle/works.
Basic Requirements
Vehicles should:
-
be conspicuous
-
have a roof-mounted beacon operating
-
Display a Keep Left/Right sign to drivers approaching on the same side of the
carriageway, indicating which side to pass on. Table 3 gives the minimum size
of the sign.
Additional Static Signs
Additional Static Signs shall be provided in cases where:
-
the works vehicle cannot be seen clearly because of hills, or bends in the road.
-
traffic may build up.
-
there is not enough space for traffic to move past the works vehicle(s).
-
the vehicle is slow moving or is required to make periodic stops.
In cases like those above,
-
Road Works signs shall be provided with appropriate supplementary plates.
-
Road Narrows signs with Single File Traffic plates shall also be displayed to
drivers approaching in each direction.
Work should not be carried out further than I km from these signs.
In cases where work is taking place across a junction, a ‘Road Works Ahead’ sign
should be displayed to drivers approaching on a side road.
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2.17 Mobile Works on Graded Roads
2.17.1
Re-grading Works on Graded Roads
Re-grading work is a continuous mobile operation of one or more mechanical road
graders working on existing graded roads (with or without water bowsers; with or
without rollers). Where material is obtained from and deposited to the windrows at the
side of the road (it does not include re-sheeting operations - see Section 2.17.2), and
therefore road works signage is required.
In general, re-grading works on graded roads involve either the temporary partial
closure of sections of the road, or the temporary total closure of sections of road.
Whilst the former will allow traffic, in single file, to continue to use the road, the latter
will require either the road to be closed off, with alternative route signs being placed
at appropriate road junctions at opposite ends of the works, or the traffic (those with
four-wheel drive capacity) will be temporarily required to go off the road and
circumvent the works area.
The option of having properly constructed traffic detours alongside the road is not
normally available. Those vehicles without four wheel drive capacity wheel, either
have to turn back (all assuming that there is sufficient space to execute such a
manoeuvre safely and find an alternative route, or wait until it is safe to pass the
grading team on the road.
To warn road users that road grading is in progress, a combination sign shall be
used as shown below. This can either be set up or on a static tripod which is
periodically relocated as required, or fitted on the back of a works pick up for quick
sign erection, (see Signs Delivery Vehicle; Section 2.3.3). If the later method is used,
the vehicle shall be safely parked to the side of the road in clear view of oncoming
traffic; under no circumstances are such vehicles allowed to move with the boards
erected.
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Sign is made up of HS205, details found in SP1284, which is slightly
modified
to
read
CAUTION Road Grading
Ahead, Slow Down –
Pass Safely,
as well as the Road
Works Ahead, HS024
and the Hazard Ahead
sign HS029 and fixed on
a single hinged board.
The top section of the sign is hinged so that it is lowered/fastened when not in use.
The backside of the top section is painted the same as the colour of the vehicle.
When the board is in use the vehicle shall be stationary.
Additional signs may need to be provided if road surface conditions during re-grading
dictates:If through watering the Works the road is likely to become
slippery, appropriate signage shall be used to indicate this
hazard.
Also, if during the Works, between grading and rolling, sections
of the road (being used for access) have excessive loose
chippings, appropriate signage shall be used to indicate this
hazard.
Either one of the above signs can be added to the combination board, by
replacement of the hazard warning sign:
Because of the need to periodically move the signs, no more than 5km of graded
roads shall be re graded any one time. On completion of a portion of the re grading
works the signs shall be moved and relocated to their new position before
commencement of the works.
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Sign is made up of
HS-205, details found
in SP-1284, which is
slightly modified to
read CAUTION Road
Grading Ahead, Slow
Down – Pass Safely,
as well as the Road
Works Ahead, HS024
and the Hazard
Ahead sign HS029
and fixed on a single
hinged board.
If Road Repair Works, which includes such works as the filling up of potholes, etc.,
are likely to cause a safety hazard to either the Road User or the Repair Crew doing
the repair. A temporary Double Detour, using the hard shoulders of the road, shall be
implemented as shown on Figure 21. The width of the lanes of such a detour shall
be a minimum of 3 metres, and the entire length of Works shall be marked off with
cones as shown on Figure 21. Single contra flow system shall be avoided.
2.17.2
Re-sheeting Works on Graded Roads
In general, re-sheeting works on graded roads involve the temporary total closure of
sections of the road being worked on, hence alternatives have to be established for
road users, as follows (in order of preference):
-
detour by alternative existing road(s),
-
detour by temporarily established road.
In both instances the detour route shall be clearly marked and sign posted.
In general, the option of constructing separate Double Detours in unrestricted terrain
(which consists of two parallel one way temporary roads constructed on each side of
the road being re-sheeted) is not permitted.
In restricted terrain and under special circumstances, say, due to:
1. limited working space created by, large rock outcrops, hill cuttings and deep
wadi beds
2. the likely high cost in forming supplementary temporary road embankments
3. restrictions formed by buildings/ walls/ trees/ etc.,
Double Detours are permitted, however these are formed in part by the hard shoulder
of the road and in part by extra road material being added such that the resulting
detour has a minimum-n width of 4 metres (see Figure 22). In such cases extra
warning signs shall be used to reduce traffic speeds along the detour, also the entire
length of the Works shall be marked off with cones as shown on Figure 22.
The use of a contra flow system (where traffic, in both directions, use the same single
detour, of limited width, and controlled by "Stop / Go Boards") along the hard
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shoulder, should be avoided, and shall only be used if the length of the Works, from
the start of the taper to the end of the taper, is 150m or less.
The Company Site Representative shall be informed in cases where either double
detours or contra flow systems are being used in the Works.
Single Detour
The Single Detour, which is shown on Figure 23, shall be a two way temporary road
constructed parallel to the existing road, at a minimum of 10 metres away from the
road being re sheeted (inner road edge to the inner road edge), having a minimum
width of 7 metre (actual width selected shall depend on how long the detour is going
to be used). The Contractor shall shape and grade the detour and shall make full use
of the material that can be obtained from alongside the detour or immediate vicinity.
All material shall be watered, mixed and compacted with suitable compaction
equipment to give sufficient density to the material so that it will be capable of
carrying traffic without undue wear or distress. In case of disagreement between the
Company and the Contractor as to the adequacy of this compaction, a dry density of
95% of modified AASHTO density shall be taken as the required minimum density,
for details Refer SP-1279 Specification for Civil & Building Construction. Access of
construction traffic to the work site shall at all times be from the side opposite the
detour, to ensure separation of construction and passing traffic. Under no
circumstances shall any of the construction traffic use the detour for access or for
turning, etc.
The minimum signage requirements are shown in Figure 23. Depending on visibility
and terrain, further supplementary signs may be required.
2.17.3
Other Mobil Road Works on Graded Roads
Works, often for access to Utilities and Building Services, carried out on Graded
Roads, from a single vehicle or a small number of vehicles, shall be handled in the
same manner as that used for Blacktop Road (refer section 2.16).
2.18 Check List
2.18.1
Check List - Before Starting Work
Sl No
Activity
1
Have you planned how you will sign and guard the Works?
2
Has the Company Site Representative (and if necessary the
ROP) been notified of the Works?
3
Is everyone on site wearing high-visibility clothing? (see Section
2.3.3)
4
What are the correct positions for the first warning signs? (see
Section 2.4.1)
5
What other signs are needed approaching the works? (see
Section 2.4)
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6
What signs are needed at the works? (see Section 2.4)
7
What length of coned taper is required? (see Table 3)
8
How many lamps and cones will you need? (See Table 3.)
9
What width of carriageway can be kept open and will it be
enough for 2-way traffic? (see Table 2)
10
What width of footway can be kept open and will it be enough
for 2-way traffic? (see Section 2.11.1)
11
What form of traffic control is needed? (see Section 2.10)
12
Have any misleading permanent signs been covered?
13
Has the Company Site Representative been informed of all the
issues requiring his consultation/ approval?
2.18.2
Check List - When Work is in Progress
Sl No
Activity
1.
If circumstances change, have you altered the signs, cones and
lamps to suit?
2.
Are signs, cones and lamps being regularly cleaned, maintained
or replaced?
3.
Has formal authorisation been obtained to accommodate any
changed circumstances?
4.
When traffic control changes are made at night or weekends,
have the warning signs been changed?
5.
Are traffic control arrangements reviewed and changed to reduce
delays as the work changes?
6.
Has the Company Site Representative been informed of all the
issues requiring his consultation/ approval?
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2.18.3
Check List - When Work is Complete
Sl No
Activity
1.
Have all signs, cones and lamps been removed (see Section
2.3.7)?
2.
Have all permanent signs been restored?
3.
Has the completed works, in any way, resulted in the need to alter
the configuration/ location of the permanent signs?
4.
Has the Company Site Representative (and if necessary the ROP
been notified that the work is complete?)
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Engineering Specification for ‘Safe Road Works’
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3 Appendix
Appendix A: Glossary of Definitions & Abbreviations
Appendix B: Tables
Appendix C: Signs, Equipments & Layout Drawings for Road Works
Appendix D: SP User – Comment Form
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3.1
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Appendix A: Glossary of Definitions & Abbreviations
For the purposes of this document, the following definitions, terminology and
abbreviations shall apply.
3.1.1
Page 32
A.1: General Definitions & Terminology
Shall
:
The word 'shall' indicates a requirement
Should
:
The word 'should' indicates a recommendation
the Company
:
Petroleum Development Oman L.L.C.,
the Contractor
:
The party with which the Company has entered into a
Contract
Manufacturer
:
A Party responsible for the manufacture of equipment and
services to perform the duties specified by the Consultant or
the Company.
Vendor / Supplier
:
A party responsible for the supply of equipment, materials or
product related services in accordance with the purchase
order issued by PDO or its nominated purchasing office.
Local Agent
:
An authorised agent of a Manufacturer in the Sultanate Of
Oman who can supply the product and services.
National Product
:
A product defined as a National Product, in origin
manufactured in the Sultanate Of Oman as per the General
Conditions of Contract.
GCC Product
:
A product defined as a GCC Product, in origin manufactured
in GCC country as per the General Conditions of Contract.
Works
:
The permanent Works to be executed and maintained in
accordance with the contract together with all temporary
works of every kind required in or about the execution or
maintenance of the Works.
Workshop
:
A defined place, approved by the Company, where the
Contractor executes fabrication works.
Worksite
:
The land and other places on, under, in or through which the
Works are to be executed.
the User
:
The Company, and/or Consultant, designate using this
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3.1.2
A.2: Site Layout Definitions
Works Area
:
The excavation, chamber, opening, painting, etc, at which
work is carried out.
Working Space
:
The space around the works area required storing tools
excavated material, equipment and plant together with the
space required by the workers to move around in to do the
work.
Safety zone
:
The zone provided to protect workers from the traffic and to
protect the traffic from workers.
Note: See Figure 6 & 7 in Appendix C for the Works Area, Working Space and
Safety Zones.
3.1.3
A.3: Abbreviations
The following abbreviations are used in this document.
Page 33
AASHTO
:
American Association of State Highway and Transport
Officials
CBR
:
California Bearing Ratio
CFDH
:
Corporate Functional Discipline Head
DEP
:
Design and Engineering Practice (SIEP / Shell GSI
Standard)
EPC
:
Engineering, Procurement & Construction
ERD
:
Engineering Reference Document
GCC
:
Gulf Cooperation Council
HSE
:
Health, Safety and Environment
HDS
:
Highway Design Standards
MOC
:
Ministry of Communications
MRME
:
Ministry of Regional Municipalities & Environment
PDO
:
Petroleum Development Oman LLC
ROP
:
Royal Oman Police
Shell GSI
:
Shell Global Solutions International B.V.
SIEP
:
Shell International Exploration and Production B.V.
SIC
:
Shell International Chemicals B.V.
SP
:
Specification
SRD
:
HSE (Safety) Reference Document
Engineering Specification for ‘Safe Road Works’
Printed 09/09/17
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Version: 3.0
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Petroleum Development Oman LLC
3.2
Appendix B: List of Tables
Table 1 - Safety Zones Clearances
Speed restriction (km/h)
Minimum long ways
Clearance (L) (metres)
Minimum
sideways
clearance (S) (metres)
50
10
0.5
60
15
0.5
80
30
1.2
Note: Safety Zone clearances for more than 80 km/h, refer Highway Design Manual as
listed in section 1.5.
Table 2 - Reduced Road Widths
Traffic Passing the works
Road Width (W) (metres)
2-way traffic
5.5 m minimum
1-way traffic
3.5 m minimum
3.7 m maximum
Table 4 - Road Danger Lamps
Type of lamp
Conditions of Use
Only to be used when all the following conditions
apply:
1.
Flashing lamp (120 to
150 flashes per minute)
The speed limit is 50km/h or less
The Road Danger Lamps is within 50m of an
illuminated street lamp.
2.
Page 34
Steady lamp
To be used when conditions in 1 above do not apply:
on any road with or without street lighting.
Engineering Specification for ‘Safe Road Works’
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Table 3 - Size & Sighting Distances of Signs & Cones
Type of Road
All purpose single carriageway
road, within Residential and
Industrial Areas, restricted to
50 km/h or less.
All purpose single carriageway
road, outside Residential and
industrial Areas, restricted to
60 km/h or less
All purpose single carriageway
road, restricted between 60
km/h and 80 km/h
Minimum
distance of 1st
sign in
advance of
Works (D)
(metres)
23 to 46
46 to 110
275 to 458
Minimum
clear
visibility of
1st sign
(metres)
60
60
75
Details of lead-in cone tapers (see Note 1 & 2)
Minimum
size of
signs
(mm)
750
750
750
Minimum
height of
cones
(mm)
450
450
450
Width of Hazard
1
2
3
4
5
6
7
Length of taper (T) metres
13
26
39
52
65
78
91
Minimum No. of cones
4
4
6
7
9
10
12
Min. no. of lamps at night
3
3
5
6
8
9
11
Length of taper (T) metres
20
40
60
80
100
120
140
Minimum No. of cones
4
6
8
10
13
15
17
Min. no. of lamps at night
3
5
7
9
12
14
16
Length of taper (T) metres
25
50
75
100
125
150
175
Minimum No. of cones
4
7
10
13
15
18
21
Min. no. of lamps at night
3
6
9
12
14
17
20
Size and Sighting distances for the speed range of above 80 km/h refer Highway Design Manual as listed in section 1.5.
Notes:
1.
Lead-in tapers used with traffic control, and all exit tapers shall be about 45º to the kerb line with cones spaced 1.2 m apart.
2.
The maximum spacing distance of cones in longitudinal lengths of coning shall be 9m, but no less than 2 cones shall be used in any length between tapers .
3.
The range of sighting distance (D) is given to allow the sign to be placed in the most convenient position taking account of available space and visibility for drivers.
Page 35
Engineering Specification for ‘Safe Road Works’
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3.3
Version: 3.0
Effective: July-17
Appendix C: Signs, Signboards, Equipments & Layout for Road
Works
3.3.1
C.1:
List of Figures for Basic Signs & Signboards for Road Works
Figure 1
:
Basic Signs & Equipments
Figure 2
:
Additional Signs
Figure 3
:
Supplementary Plates
Figure 4
:
Permitted Combination of Signs & Supplementary Plates
Figure 1 – Basic Signs & Equipments
Page 36
Engineering Specification for ‘Safe Road Works’
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Figure 2 – Additional Signs
Page 37
Engineering Specification for ‘Safe Road Works’
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Figure 3 – Supplementary Plates
Page 38
Engineering Specification for ‘Safe Road Works’
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Figure 4 – Permitted Combinations of Signs & Supplementary Plates
For other permitted combinations refer SP-1284 Specification for Signs & Sign
Boards – Standard Sign Catalogue & Oman Highway Design Manual section 20.5
Page 39
Engineering Specification for ‘Safe Road Works’
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3.3.2
Version: 3.0
Effective: July-17
C.2: List of Figures for Signs & Layout Drawings for Various Road Works
This appendix contains the layout drawings for Road Works Signs for various road
work conditions:
Figure 6
:
Basic Equipment Site Layout
Figure 7
:
Basic Equipment Site Layout with Vehicle
Figure 8
:
Basic Signs Site Layout
Figure 9
:
Traffic Control By Give & Take System
Figure 10
:
Traffic Control By Priority Signs
Figure 11
:
Traffic Control By Stop/Go Boards
Figure 12
:
Traffic Control By Portable Traffic Signals
Figure 13
:
Works on Footways
Figure 14
:
Works on Footways with Temporary Foot- way in Carriageway
Figure 15
:
Works on 2-Lane Single Carriageway (with Conspicuous
Vehicle)
Figure 16
:
Works in Centre of 2 Lane Carriageway
Figure 17
:
Works at Pedestrian Crossings
Figure 18
:
Works at approaches (near) to the Road Junctions
Figure 19
:
Works at Road Junctions
Figure 20
:
Works at Traffic Signals
Figure 21
:
Repairs Graded Roads - Double Detour
Figure 22
:
Re-sheet Graded Roads - Double Detour
Figure 23
:
Re-sheeting Works - Single Detour
It should be noted that whilst the Appendix portion of this document has been specially
developed such that it can be relatively easily removed from the main body of the
document and copied, and later handed out to Road Workers to be used in the field as
considered necessary. It is the responsibility of the User to ensure that those using the
Appendix are fully familiar with the contents of the main document i.e., that either they
have read and understood the main document, or have had the contents fully explained
to them so that they know where to obtain further information, if at all required.
In the event of a layout being required which is not being shown in figures 6 to 22 of
this document, then refer section 20.5 of Oman Highway design standard volume-2 and
its further referenced international standards.
Page 40
Engineering Specification for ‘Safe Road Works’
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A barrier may be required,
see section 2.2.2.5
Advance signs where
required see Section 2.4
Figure 6 – Basic Equipment site Layout
Page 41
Engineering Specification for ‘Safe Road Works’
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Advance signs where
required see Section 2.4
Figure 7 – Basic equipment site layout with vehicle
Page 42
Engineering Specification for ‘Safe Road Works’
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Figure 8 – Basic Signs Site Layout
Page 43
Engineering Specification for ‘Safe Road Works’
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Figure 9 – Traffic Control by “Give & Take” System
Page 44
Engineering Specification for ‘Safe Road Works’
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Figure 10 – Traffic control by priority signs
Page 45
Engineering Specification for ‘Safe Road Works’
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Figure 11 – Traffic Control by Stop/Go Boards
Page 46
Engineering Specification for ‘Safe Road Works’
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Figure 12 – Traffic Control by Portable Traffic Signals
Page 47
Engineering Specification for ‘Safe Road Works’
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Figure 13 – Works on Footways
Page 48
Engineering Specification for ‘Safe Road Works’
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Figure 14 – Works on Footways with Temporary Footway in Carriageway
Page 49
Engineering Specification for ‘Safe Road Works’
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Figure 15 – Works on 2-lane single carriageway (conspicuous vehicle)
Page 50
Engineering Specification for ‘Safe Road Works’
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Figure 16 - Works in Centre of 2-lane Single Carriageway
Page 51
Engineering Specification for ‘Safe Road Works’
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Figure 17 – Works at Pedestrian Crossings
Page 52
Engineering Specification for ‘Safe Road Works’
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Figure 18 – Works at approaches (near) to the Road Junctions
Page 53
Engineering Specification for ‘Safe Road Works’
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Figure 19 – Works at Road Junctions
Page 54
Engineering Specification for ‘Safe Road Works’
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Figure 20 – Works at Traffic Signals
Page 55
Engineering Specification for ‘Safe Road Works’
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Figure 21 – Repairs to Graded Roads Works – Double Detour
Page 56
Engineering Specification for ‘Safe Road Works’
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Figure 22 – Re-sheeting Graded Roads past rock outcrops – Double Detour
Page 57
Engineering Specification for ‘Safe Road Works’
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Figure 23 – Graded Roads Works – Re-sheeting Single Detour
Page 58
Engineering Specification for ‘Safe Road Works’
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3.4
Appendix D: SP User - Comment Form
SP User-Comment Form
If you find something that is incorrect, ambiguous or could be better in an SP, write your
comments and suggestions on this form. Send the form to the Document Control Section
(DCS). They make a record of your comment and send the form to the correct CFDH. The
form has spaces for your personal details. This lets DCS or the CFDH ask you about your
comments and tell you about the decision.
SP Details
Title
Issue Date:
Heading Number:
Figure Number:
Number:
Page number:
Comments:
Suggestions:
User’s personal details
Name:
Ref. Ind:
Signature:
Date:
Phone:
Document Control Section Actions
Comment Number:
CFDH
Dates
Recd:
To CFDH:
Ref. Ind:
CFDH Actions
Recd Date:
Decision:
Inits:
Reject:
Ref.
Ind:
Date:
Date:
Inits:
Accept, revise at next issue:
Accept,
issue
amendment
temporary
Comments:
Originator
Advised:
Page 59
Date:
Inits:
Document Control
Section Advised:
Engineering Specification for ‘Safe Road Works’
Printed 09/09/17
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