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T.P*D*M.V*2.4
4.3.15 Widths of Carriageways in Junctions
4*3.15.1 Where carriageways at junctions go round low radius corners
widening should be provided to cater for the swept path of long
vehicles* Also, at physical island layouts, with single
carriageways greater than 50m in length, an allowance should be
made for broken down vehicles.
4*3.15.2 Table 4*3.15.1 shows recommended widths of carriageway corresponding
to various near side corner radii. The recommendations
for "Single Lane Width" are based on the requirements of a 16.0m
long articulated vehicle. The recommendations for "single lane
width to pass stationary vehicle 11 are subdivided into three
standards. The 6m effective width column should be considered
as the normal standard and would allow any vehicle to pass any
other vehicle. Reduced standards may be considered appropriate
and the 5.2m effective width column will provide sufficient
space for a goods vehicle to pass a stationary car but not for a
goods vehicle to pass another goods vehicle or bus. Similarly,
whilst the 4.3m effective width will allow a car to pass another
stationary car it is unlikely that a goods vehicle or bus would
be able to pass a stationary car* The "two lane width for one
way or two way traffic" columns represent two standards* The
normal minimum column would allow operation of the 16m
articulated vehicle while the absolute minimum column represents
a reduced standard which should not be used on bus routes or in
situations with more than the minimum volumes of medium and
heavy goods vehicles.
Inside
Corner
Radius
_(m)
Single
Lane
Width
(a).
10 8.4
15 7.1
20 6.2
25 5*7
30 5.3
40 4.7
50 4.4
75 4.0
100 3-8
150 3.65
Table 4.3.15>1
Width of Carriageways in Junctions
Single Lane Width with Space
to Pass Stationary Vehicle
Including Hardstrip Provision(m)
Effective
Width 6m
10.9
9.6
8.7
8.2
7.8
7.2
6.9
6.5
6.3
6.0
Effective
Width 5.2m
9.5
8.2
7.3
6.8
6.4
5.8
5.4
5.2
5.2
5.2
Effective
Width 4.3m
8.4
7.1
6.2
5.7
5.3
4.7
4.3
4.3
4.3
4.3
Two Lane Width
for One Way or
Two Way Traffic(m)
Normal
Minimum
14.9
13.1
11*8
10*9
10.3
9.3
8.7
8.0
7.6
7.3
Widths are exclusive of hardstrips, where present, except
for "single lane width to pass broken down vehicles". For
explanation of various columns see paragraph 4.3*15.2.
Absolute
Minimum
9.5
9.0
8.7
8.5
8.2
7.9
7.7
7.4
7.3
7.0