Civil Engineering MCQAE Level Civil Engineering
As per IRC standards, the minimum radius of horizontal curve on a plain/rolling terrain National Highway for a design speed of 100 km/h is:
Transportation EngineeringIRC Geometric DesignMEDIUM
Choose the correct answer
A
100 m
B
360 m
C
450 m
D
600 m
Correct Answer
C. 450 m
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IRC 73: Minimum radius R = V^2 / (127(e+f)) where e = superelevation, f = lateral friction. For V=100 km/h, e_max=7%, f=0.15: R_min = 100^2/(127 x 0.22) = 360 m (ruling). For 0 superelevation and f=0.15: about 528 m. IRC 73 Table specifies R = 450 m ruling for V=100.
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