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T.P.D.M.V.2.3
(Al/2001)
3.4.5 Service Roads
3.4.5.1 Table 3.4.5.1 indicates the carriageway widths to be used for service roads.
Table 3.4.5.1
Carriageway Widths of Service Roads (m)
Carriageway Type Cars Only All Vehicles
One Way 4.5 5.5
Two Way 5.5 6.75
Industrial Fire Escape & Rear Service Road — 7.3
3.4.5.2 For service roads less than 6m in width, an overall width, when clear of any obstructions, of
at least 6m, but which may include adjacent kerbs, footways or verges, must be provided to
allow fire service appliances to operate in the event of emergency.
3.4.5.3 Service roads, which are sometimes provided to reduce the number of points of access on to
a major road, should only be considered when the alternative of providing a rear access road
system connecting to the major road through proper junctions is found to be impracticable.
Where such service roads are provided careful attention needs to be given to the junction
arrangement of the service road with the main road and any side road as because of the
restricted visibility of traffic on the service road these junctions can have a high accident
risk potential. Consideration should be given to reducing as far as possible likely traffic
conflict points.
3.4.5.4 The verge between the main carriageway and the service road should generally be 2 m in
width and never less than 1.5 m. Additional local widening may be necessary however in
the vicinity of junctions.
3.4.5.5 Fire Escape and Rear Service Roads in Industrial Areas should be 7.3 m in width.
3.4.5.6 Details of turning areas are given in Diagrams 3.4.5.1 & 3.4.5.2. However Chapter 2, and
Chapter 4 should also be referred to if there is any doubt as to the adequacy of the areas in
terms of the type of vehicles likely to use them.