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Question

The superelevation needed for a vehicle travelling at a speed of 60 kmph on a curve of radius 128 m on a surface with a coefficient of friction of 0.15 is

A
Zero
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B
0.071
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C
0.022
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D
0.015
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Solution

The correct option is B 0.071
Superelevation is given by the relation

e+f=v2gR

if V is in km/hr, then

e+f=V2127R

e+0.15=(60)2127×128

e=0.071

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