Civil Engineering MCQJE Level Civil Engineering
The ruling design speed for National Highways in plain terrain as per IRC:SP:73 is:
Transportation EngineeringTransportation EngineeringEASY
Choose the correct answer
A
60 km/h
B
80 km/h
C
100 km/h
D
140 km/h
Correct Answer
C. 100 km/h
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IRC:SP:73 (2015) and IRC:SP:84: Design speed for 4-lane NH in plain terrain = 100 km/h (ruling) with desirable 120 km/h. Design speed governs: sight distance, superelevation, radius of curve, gradient. Higher design speed → flatter curves and gentler grades but higher cost.
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