CSTR: Part D21 Design – Road Geometry
Edition: February 2011
PART D21
DESIGN - ROADS
CONTENTS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
1.
General
References
Design Requirements
Pedestrian Facilities
Cycling Facilities
Public Transport Facilities
Property Accommodation
Rail requirements
Future Expansion and Extension Considerations
Records
GENERAL
This Part specifies the requirements for the geometric design of roads, pedestrian facilities and cycle facilities.
2.
REFERENCES
Unless specified otherwise, all design must be undertaken in accordance with the following:
1.
DPTI: Road Design Standards and Guidelines (Refer: http://www.dpti.sa.gov.au/standards).
2.
DPTI: Pavement Marking Manual (Refer http://www.dpti.sa.gov.au/documents/tass).
3.
Austroads: Guide to Traffic Management
4.
Austroads: Guide to Road Design
5.
AS 1428 "Design for Access and Mobility".
6.
DPTI Guidelines for Disability Access in the Pedestrian Environment, (Refer:
http://www.dpti.sa.gov.au/documents/tass)
7.
Austroads: Design Vehicles and Turning Path Templates
3.
DESIGN REQUIREMENTS
3.1
Design Environment
The Works are deemed to be located in an urban/rural environment.
3.2
Traffic Volumes
DESIGN TRAFFIC VOLUMES
Location
Annual Average
Daily Traffic
% Commercial
Vehicles
Design Hourly
Volume
Minimum
Operating Speed
(km/h)
e.g. Main Carriageway or
Road Name
Or refer to an appendix in lieu of the above table.
3.3
Traffic Volume Lane Distribution
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Insert any contract specific requirements here
eg
(a)
provision for bus movements including longer buses and/or movement to and from bus bays;
(b)
the level of access for restricted access vehicles such as the longer articulated vehicles like
B-Doubles/Triples;
(c)
special provision for turning vehicles stating the location and requirements, or specific local
traffic management issues which might preclude access to certain areas;
(d)
special or additional lane width or clearance requirements, e.g. for local streets.
Car park and Kiss and Ride Accesses
Passenger car
Access to Interchange (from South Road, Sturt Road
and Southern Expressway
12.5 m rigid bus/19.0 m articulated bus
Internal road (bus only) network
12.5 m rigid bus/19.0 m articulated bus
Internal road network – other
8.8 m service vehicle
New Science Park Access Road
12.5 m single unit truck
Birch Crescent Realignment
8.8 m service vehicle
Flinders Drive/South Road/Interchange Access
Intersection
12.5 m rigid bus/19.0 m articulated bus plus 12.5 m
single unit truck and passenger car
Flinders Drive/Flinders Private Hospital Access
Road junction
12.5 m single unit truck
3.4
Design Speed
eg
Element
Elevated Roadway
South Road Superway Main Alignment (Regency Road to the southern end of the Elevated
Roadway)
Elevated Roadway ramps – Grand Junction Road
Design Speed
(km/h)
100
90
80
Elevated Roadway ramps – connection to the Port River Expressway and Salisbury Hwy
80
South Road At-Grade roads (local access roads)
70
Northern Connector (main alignment, north of the Port River Expressway ramp gore area)
Northern Connector (ramps from / to the Port River Expressway to the Northern Connector
gore area)
Port River Expressway / Salisbury Highway east-west connection
120
Local Council maintained roadways
60
DPTI Arterial Roads
70
100
90
The design speed of loop ramps associated with the Northern Connector interchange may be reduced in accordance
with Austroads Guide to Road Design Part 4C Interchanges, clause 6. Adoption of lower design speeds for
interchange ramps must incorporate adequate speed change arrangements to provide for transitions from highway
speeds to ramp speeds.
3.5
Geometric Design
South Road Superway Main Alignment
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The South Road Superway Main Alignment must provide a motorway standard roadway from the Elevated Roadway
to Regency Road must provide for the specified design vehicle, capacity and connectivity.
Median openings on the at-grade section of South Road Superway Main Alignment between Aruma Street and
Regency Road must all be closed to maintain a free flow non-stop corridor
South Road At-Grade
The South Road At-Grade must provide to provide a local access roadway for local or regional access under and/or
adjacent to the Elevated Roadway for the specified design vehicle, capacity and connectivity.
Intersections with Council Maintained Roads
Intersections must be provided with the following features and connectivity:
(a)
Wing street – provide east west connectivity, and all movements from both the one way
southbound local access road from Salisbury Highway and two way local access road from South
Terrace;
(b)
York Street – a new T intersection to provide for all movements is desirable;
(c)
Leed Street – a new T intersection to provide for all movements except left-out is desirable;
(d)
South Terrace - provide a signalised intersection to provide for all movements except for rightturn in from South Road At-Grade. Signals to be coordinated with the Wingfield railway crossing;
The design must comply with the minimum clearance/cover required by the owners of all overhead and/or
underground utility services affected by the Works.
3.6
Design Level of Service
eg
Level of Service assessment must be undertaken on the roadway to determine the future congestion of the roadway
in accordance with Austroads Road Design Guide, Guide to Traffic Management Part 2.
Level of Service and traffic modelling assessments must be completed for all intersections to determine the future
congestion and performance of intersections in accordance with Austroads Road Design Guide, Guide to Traffic
Management Part 3.
The minimum Design Level of Service is detailed in the table below.
Location
Minimum Level of
Service
Traffic Volumes
Elevated Roadway
D
2031
South Road Superway Main Alignment (Regency Road to the Elevated
Roadway)
D
2031
Interchange with Port River Expressway / Salisbury Highway
D
2031
Future Northern Connector interchange
D
2031
DPTI arterial roads
E
2031
South Road At-Grade (local access roads beneath the Elevated
Roadway)
E
2031
All signalised intersections
E
2031
The Contractor must demonstrate the Level of Service that can be achieved for all roadways and intersections and
demonstrate measures to further maximise Level of Service, such as ramp metering, ITS technology.
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CSTR: Part D21 Design – Road Geometry
Where the design level of service specified cannot be achieved on all intersection movements within the road reserve
and land and property acquisition provided the Contractor must:
3.7
(a)
maximise the intersection design within the existing road reserve and land acquisition boundary;
(b)
maximise the level of service of the major traffic movements;
(c)
demonstrate the average level of service provided at the intersection; and
(d)
demonstrate measures to further maximise Level of Service, such as ramp metering, ITS
technology.
Sight Distance
(a)
3.8
3.9
any height controls that may affect sight distance at particular locations:
Vertical Clearances To Bridges/Structures
(a)
minimum design clearances for bridges over certain road classes;
(b)
design clearances required for navigable waterways;
(c)
design clearances required for tramway routes:
Design Vehicle
The design of all roads must allow for the design vehicle, including accommodation of vehicle swept paths, for all
through lanes, turning and deceleration lanes and intersections.
The free flow carriageways must be designed in accordance with Level 3 access (i.e. B-Triple and A-Double
(Double Road Train)) requirements of the National Transport Council Performance Based Standards Scheme
Network Classification Guidelines.
The design must make allowance for over-dimensional / over-mass vehicles as per DPTI Over Dimensional Route
Network as detailed in Appendix D021.3 DPTI Heavy Vehicle Access Framework
Design vehicles must be as shown in the table below:
Location
Elevated Roadway from Port River Expressway / Salisbury Highway to the
Grand Junction Road Interchange
Elevated Roadway and Main Alignment south of the Grand Junction Road
Interchange
Elevated Roadway ramps at Grand Junction Road and Port River
Expressway / Salisbury Highway
Taminga Street / South Road At-Grade Intersection
Aruma Street / South Road At-Grade Intersection
Camira Street / South Road Superway Main Alignment intersection
Tikilara Street / South Road Superway Main Alignment intersection
Regency Road / South Road Superway Main Alignment intersection
Design Vehicle
A Double & B Triple
B Double
A Double & B Triple all
movements
A Double & B Triple left in
B Double left out
A Double & B Triple left in
B Double left out
A Double & B Triple left in
B Double left out
A Double & B Triple left in
B Double left out
B Double all movements
All existing road access, including access for over dimensional vehicles to properties along the South Road
Corridor must be maintained. Any alterations to current access arrangement are to be approved by the Principal.
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The Contractor must provide any additional drawings or modelling to demonstrate the road design can
accommodate the design vehicle.
The A-Double, B-Double and Semi Trailer (heavy articulated) design vehicle must be in accordance with DPTI
heavy vehicle access framework Appendix D021.3.
The B-Triple design vehicle must be in accordance with the National Transport Council Blueprint B-Triple
Specification that is deemed to satisfy level 3 Performance based specification requirements with an overall
maximum length of 34.29m.
The design vehicles adopted for double right turns must provide for simultaneous movements of the Design Vehicle
and a 8.8m service vehicle, with the service vehicle in the median lane.
The design of left turns at unsignalised intersections may allow the Design Vehicle to enter the adjacent lane, where
it can be demonstrated that:
3.10
(a)
the manoeuvre is a legal movement for the Design Vehicle;
(b)
current access conditions are maintained; and
(c)
reduces or results in no additional property acquisition.
Traffic Lanes and Widths
The Contractor must undertake traffic modelling to determine the number, configurations and length of traffic lanes
to the meet the level of service requirements specified In addition the number of traffic lanes provided must meet the
minimum requirements as detailed in the following tables. Traffic modelling must be based on the volumes specified
in Appending D021.2.
Lane and shoulder widths are to be in accordance with Austroads Road Design Guide or the AS 5100 "Bridge
Design" as applicable. Notwithstanding the above, all shoulder widths must provide for road design requirements
and in particular horizontal sight distances, including for future expansion to the specified number of lanes.
The minimum number of traffic lanes on the Elevated Roadway and South Road Superway main alignment must be
as shown in the table below:
Main Alignment & Elevated Roadway
Ramp from the Elevated Roadway to the Salisbury
Highway
Ramp from the Elevated Roadway to the Port River
Expressway
Rampfrom the Salisbury Highway to the Elevated
Roadway
Ramp from the Port River Expressway to the Elevated
Roadway
Port River Expressway / Salisbury Highway to Grand
Junction Road Interchange
3.11
Minimum Number of Traffic Lanes
Two lanes
One lane
Two lanes
One Lane
Three lanes with provision for future expansion to four
lanes in each direction.
Weaving Analysis
Analysis of Traffic weaving to determine the level of service between interchanges must be undertaken using the
DPTI Aimsun Modelling manual as detailed in Appendix D021.5.
Traffic movements for weaving analysis must be determined based on the MASTEM Select Link Model (Weaving) as
detailed in appendix D021.6.
4.
PEDESTRIAN FACILITIES
Continuous and fully accessible movements for pedestrians must be provided at-grade for the entire length of the
Works. Existing pedestrian connectivity must be maintained.
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CSTR: Part D21 Design – Road Geometry
Pedestrian crossing facilities must be provided to connect to the east-west road network at signalised intersections,
including provision of pedestrian actuated crossings.
There must be no pedestrian provision along the Elevated Roadway and pedestrian thoroughfares are to be diverted
away from Elevated Roadway on / off ramps and approach ramps
All elements of footpaths and pedestrian crossings must allow for disability be in accordance with AS 1428 Design
for Access and Mobility, the Austroads Guide to Road Design and DPTI’s Guidelines for Disability Access in the
pedestrian environment.
5.
CYCLING FACILITIES
Cyclist facilities must be provided to enable connectivity between the Port River Expressway / Salisbury Highway,
along the local access roadway and South Road Superway Main Alignment.
Cyclist facilities must be designed to maintain priority and travel speed of cyclist as a road user, including
provision for cyclists within the roadway and at intersections. Connections to east-west streets and intersections
must be provided to link to the existing and future local area bicycle network.
Cyclists must be prohibited from the Elevated Roadway Structures and cyclist facilities must not be provided along
the Elevated Roadway. Measures are to be taken to restrict cyclists from the Elevated Roadway and encourage
cyclists to use the local access road and not the Elevated Roadway.
Cyclist facilities must be provided in accordance with the Austroads Guide to Road Design and AS 1742.9 Bicycle
Facilities.
6.
PUBLIC TRANSPORT FACILITIES
Public Transport Facilities to maintain existing public Transport Facilities must be provided for the entire length of
the Superway including indented bus bays and pedestrian shelters and bus stops.
The Contractor must obtain approval from relevant authorities for the location and details of public transport
facilities.
7.
PROPERTY ACCOMMODATION
Where property driveway crossovers and stormwater drainage connections abut the works, the Contractor must
negotiate with the property owners regarding the design of crossovers and drainage connections. The Contractor
must invite the Principal to attend these negotiations. These must include consideration of, and agreement to, the
type and width of driveway crossover at the property boundary and the method of disposal of property stormwater.
The Contractor must verify that the design of the property crossovers does not allow stormwater to flow from the
road down a driveway.
8.
RAIL REQUIREMENTS
Notwithstanding other specified vertical clearances to the Elevated Roadway a minimum vertical clearance of 7.2m
must be provided from the top of rail to the underside of the Elevated Roadway over ARTC Rail corridor to cater for
double stacked containers. This allowance is based upon Figure 7.17 “Rolling Stock Outline F” in the Code of
Practice for the Defined Interstate Rail Network.
Any permanent and temporary structures of the Elevated Roadway over the ARTC corridor must be in accordance
with ARTC requirements and clear zones and allow for future duplication of the rail line.
All piers must be outside the ARTC corridor. Buried works that protrude into the corridor must be subject to
approval by the ARTC. The Contractor must be responsible for obtaining approval from the ARTC.
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The railway crossing of South Road At-Grade and the Winfield Railway line must be in accordance with ARTC
requirements and must provide an active railway crossing integrated with traffic signals, including the signals at
South Terrace and Cormack Road.
Further details of design requirements are detailed in Part 170 Railway Provisions. All design of temporary Works
associated with the railway must be in accordance with permanent Works.
9.
FUTURE EXPANSION AND EXTENSION CONSIDERATIONS
The Elevated Roadway design must include allow for future upgrades of North-South Corridor including:
connection with the Northern Connector including the proposed Northern Connector interchange;
accommodate an additional lane in each direction;
accommodate a crossing around the midpoint of the Elevated Roadway near the Grand Junction Road Ramps to
allow for emergency vehicle access; and
flexibility to allow for connection to either an on-line or offline scheme for future southern upgrades of the NorthSouth Corridor.
10.
RECORDS
The following records must be provided to the Principal:
Drawings
The drawings described in the DPTI: Road Design Standards and Guidelines
As constructed drawings.
Reports
Surveys or reports which address:
(a)
road capacity analysis;
(b)
Level of Service (LOS);
(c)
traffic control and signal analysis;
(d)
intersection performance;
(e)
traffic barriers;
(f)
incident and emergency management and integration with emergency services; and
(g)
traffic weaving analysis.
Road Design Visualisation
The Contractor must provide visualisation of the road design in accordance with Queensland Department
of Main Roads, Drafting and Design Presentation Manual, Volume 1, Chapter 6 Visualisation.
The road design visualisation must include all road design elements and entities in the geometric model to
provide a realistic three dimensional image of the road design. Any urban design elements that may have
an impact on the road design and in particular clear zones or sight distances, must be included into the
design visualisation.
The road design visualisation must include a sight distance check and provided in a suitable format,
including an AVI file.
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