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Question

# A four lane divided carriageway has a curve 800 m long and a radius of 500 m. The safe stopping sight distance is 150 m. The pavement width is 3.5 m per lane. The minimum setback distance from the inner edge of the curve to ensure safe visibility will be:

A
9.17 m
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B
10.92 m
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C
7.47 m
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D
5.71 m
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Solution

## The correct option is A 9.17 mS=150m, L=800 m ∵L>S ∴ m=R−(R−d)cosα2 α2=180×1502π[500−(3.5+3.52)]=8.6850 ∴ set back distance from centre line, m=500−(500−3.5−3.52)cos(8.6850) =10.923 m (from centre line of inner lane) ∴ Distance from inner edge to obstruction = (10.923−3.52)=9.173m

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