Highway Engineering
If the design speed is V kmph and deviation angle is N radians, then the total length of a valley curve in meters is given by the expression

3.8 (NV3)”2
3.8 NV”2
0.38 (NV3)”2
0.38 N V3/2

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Highway Engineering
If b is the wheel track of a vehicle and h is the height of centre of gravity above road surface, then to avoid overturning and lateral skidding on a horizontal curve, the centrifugal ratio should always be

greater than b/2h and also greater than coefficient of lateral friction
less than b/2h and greater than co-efficient of lateral friction
greater than b/2h and less than co-efficient of lateral friction
less than b/2h and also less than co-efficient of lateral friction

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