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Question

The following data are related to a horizontal curved portion of a two lane highway: length of curve 200 m, radius of curve = 300 m and width of pavement = 7.5 m. In order to provide a Stopping Sight Distance (SSD) of 80 m, the set back distance (in m) required from the centre line of the inner lane of the pavement is

A
7.96
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B
7.10
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C
4.55
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D
2.54
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Solution

The correct option is D 2.54
Length of curve,
Lc=200 m
Radius,
R=300 m
Width,
W=7.5 m
SSD,
S=80 m
Lc>S,

Set back distance,

m=(R)(Rd)cosα2

α2=180S2π(Rd)=180×802π×(3007.54)
=7.687

m=(300)(3007.54)×cos(7.687)

=4.554 m

Set back distance required from the centre line of the road,
=4.5547.54=2.679 m

Option (a) is the closest.

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