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T.P.D.M.V.2.3
(Al/2001)
3.63 Layout of Run-ins
3.6.3.1 The width of run-ins should be kept to the minimum compatible with satisfactory operation
of vehicles using the run-in. The minimum width should be such that a vehicle can enter the
run in from the near side lane without encroachment onto an adjacent lane. Where access by
container vehicles is required the width should not be less than 7.3 m. Typical layouts for
run-ins are shown on Diagrams 3.6.3.1, 3.6.3.2 and 3.6.3.3.
3.6.3.2 Visibility from a run-in should subject to paragraphs 3.6.3.3, 3.6.3.4 and 3.6.3.5 be
obtainable between points 1.05m above the road and run-in level over the area described by
ABCD in Diagram 3.6.3.4 where:
(i)
(ii)
AC is a line 4.5m in length measured along the centre line of the run-in from the
continuation of the nearer edge of the carriageway of the road to which the run-in has
access, and
BC and CD, are "x" m in length, and "x" is in accordance with Table 3.6.3.1 and is
measured along the nearer edge of the road to which the run-in has access.
Table 3.6.3.1
Length of Visibility Line "x"
Design Speed of Main Road (km/h) x(m)
80 or over 150
70 130
60 120
50 60
3.6.3.3 For difficult site conditions the length of the line AC in Diagram 3.6.3.4 may be reduced but
should never be less than 2m. Such reductions however would not normally be appropriate
for Trunk and Primary Distributor Roads.
3.6.3.4 If the road forming the access with the run-in is a dual carriageway road, providing there is
no crossing point in the central reserve opposite the entrance or it is a one way road, a single
splay, defined by ABC or ADC, depending on the direction of approaching traffic, in
Diagram 3.6.3.4 would be sufficient.
3.6.3.5 Parking within the vicinity of run-ins should be avoided wherever possible and of course
should never be permitted across the actual entrance. Ideally parking should be prevented
throughout the length of the visibility splay but on District, and Local Distributor Roads,
Rural Roads and Feeder Roads this may not always be possible to achieve.
3.6.3.6 Traffic signs and other street furniture such as lighting columns will often have to be erected
within the visibility splays or may in fact, be already erected. This should not be used as a
reason for not permitting a run-in, unless serious interference with sight lines occurs and it is
not possible to relocate the item of street furniture in question.