GATE CE 2016 Set 1 — Question 63
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Transportation Engineering → Horizontal & Vertical Alignment → Extra Widening
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Question
A two lane, one-way road with radius of 50 m is predominantly carrying lorries with wheelbase of 5 m. The speed of lorries is restricted to be between 60 kmph and 80 kmph. The mechanical widening and psychological widening required at 60 kmph are designated as and , respectively. The mechanical widening and psychological widening required at 80 kmph are designated as and , respectively. The correct values of , , , , respectively are
Correct answer
(B) 0.50 m, 0.89 m, 0.50 m, and 1.19 m
Solution
1.Mechanical Widening ():
It depends on the number of lanes (), wheelbase length (), and radius of the curve (). It is independent of speed.Given , m, m:
m.
2.Psychological Widening ():
It depends on the speed ( in kmph) and the radius ( in m).At kmph:
m.
At kmph:
m.
3.Sequence:
m, m, m, m.This matches option (B).
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