Phase 2
Service Times for CBP Revisions
CBP v3
a planners guide
.
Road Speeds
Road Speeds for CBP Revisions
The Road Network Maintenance (RNM) application contains the
default road speeds for off peak & peak which are transferred
across to Georoute to calculate the driving time for travelling
to/from collection unit to first/last point and the travelling
down between collection points on a route. To produce a
successful CBP revision the default road speeds should be
reviewed locally for suitability as part of the CBP Phase 2
data gathering process. Road speeds must be reviewed as these
are critical to a successful revision to ensure that both
adequate time allowed for each route to complete to time and
that we do not build in unnecessary slack time if the speeds
applied are too lower than reality. Based on previous
Geouroute revisions, the default speeds in RNM should be
adequate for the majority of roads and will not need to be
changed. However based on local knowledge there may be a
requirement to review and change road speeds specifically
around peak times, any particular known congestion areas and in
rural areas/major roads between towns. Note if you do have to
change any road speeds how to do this is for RNM is covered in
the GIS for collections guide activity 7 and can be found on
the Pegasus support pages.
What are the default road speed values in Road Network
Maintenance?
The default road speeds that are set within RNM are:
No
Road Type
Peak KM
Off Peak
KM
Peak
MPH
Off Peak
MPH
Colour
Identifier
in RNM
1
Motorway
83
100
52
62
Blue
2
A Road
25
48
16
30
Red
3
B Road
25
42
16
26
Pink
4
Minor Road
34
42
21
26
Green
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Phase 2
Service Times for CBP Revisions
CBP v3
a planners guide
.
5
Pedestrianised
Street
N/A
N/A
N/A
N/A
Light Blue
6
Private RoadPublic Accessible
25
25
16
16
Purple
7
RM Access Road
25
25
16
16
Turquoise
8
Footpath
N/A
N/A
N/A
N/A
Orange
9
Alley
N/A
N/A
N/A
N/A
Dark Green
10
Private Road
Restricted Access
25
25
16
16
Brown
11
Local Street
26
26
16
16
Grey
Under what circumstances must you increase the default road
speeds?
Rural areas or major A/B roads between towns tend to be
understated in RNM. This is because the system can’t hold
different default values for Town/Urban/Rural areas. It is
therefore important for such road to be identified and the
default road speeds to be critically reviewed with this in
mind. As a guide in previous collection revisions undertaken,
it is not uncommon such roads speeds to be in the region of:
National
Speed Limit
Description
Peak KPH
Off Peak KM
Peak MPH
Off Peak MPH
30 mph
Approaching
outskirts of
town
Ok as is
43
Ok as is
27
40 mph
By
passes/approachi
ng rural areas
48
58
30
36
50 mph
A/B roads
between towns or
villages
single/dual
carriageway
60
72
37
45
60 mph
A/B roads
between towns or
villages single
carriageway
60
72
37
45
60 mph
A/B roads
72
87
45
54
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Service Times for CBP Revisions
CBP v3
a planners guide
.
between towns or
villages dual
carriageway
70 mph
Trunk roads
which are
similar to
Motorways but
classified as a
dual carriageway
83
93
52
57
Under what circumstances might the default speeds be slowed
down?
Town centres, and key approaches to/from these, typically can
be congested at certain times. Where this is known to be the
case the default values should be critically reviewed with
local expertise and where appropriate should be updated to
reflect this. As a guide in
previous collection revisions
undertaken, it is not uncommon for town centre speeds to be in
the region of:
1. Off Peak 10-15 mph (16-24 kph)
2. Peak 5-10 mph (8-16 kph)
The other main place road speeds might need to be slowed down
are roads approaching motorway/trunk roads these tend to
effect roads during the peak and have typical values of 5/10
mph. (8/16kph)
If locally any road speeds can not be determined from
expertise/knowledge then a small sample of routes in the
effected areas should be sampled to determine the values.
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