Widening of
Pavement on Horizontal Curves:
We = Wm
+ Wps
Where
We = Total
Widening,
Wm= Mechanical widening, to account for the off
tracking due to the rigidity of wheel base
Wm = nl2/2R
Where n =
number of lanes,
l= length of
wheel base of largest vehicle, metres (generally 6m for commercial vehicles).
Wps
= psychological widening
Wps=V/ [9.5R^(1/2)]
Where ‘V’ is
speed in kmph.
Note:
>> For
sharp curves of radius less than 50m., the extra widening shall be provided on
inner side of curve.
>> For curves of R >50m , widening shall be equally
distributed o both sides of the curves.
Extra width
of pavement on horizontal curves, as per IRC
|
Radius,m
|
Up to 20
|
21-40
|
41-60
|
61-100
|
101-300
|
>300
|
|
Single Lane
|
1.5
|
1.5
|
1.2
|
0.9
|
0.6
|
Nil
|
|
Double Lane
|
0.9
|
0.6
|
0.6
|
Nil
|
nil
|
nil
|
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