Civil Engineering MCQAE Level Civil Engineering
Neglecting side friction, super-elevation for V=60 km/h and radius R=200 m is
Transportation EngineeringOriginal practiceMEDIUM
Choose the correct answer
A
0.040
B
0.142
C
0.160
D
0.080
Correct Answer
D. 0.080
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IRC superelevation formula (neglecting lateral friction): e = V^2 / (225*R), where V = design speed (km/h) and R = radius of horizontal curve (m). Derived from IRC equilibrium equation: e + f = V^2/(127R); setting f = 0 gives this formula. Max superelevation: 0.07 (plain/rolling terrain), 0.10 (hill roads) per IRC 38:2019. e=V²/(225R)=60²/(225×200)=0.080.
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