Highway Engineering
The desirable length of overtaking zone as per IRC recommendation is equal to

overtaking sight distance
three times the overtaking sight distance
two times the overtaking sight distance
five times the overtaking sight distance

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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

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
greater than b/2h and also greater than coefficient of lateral friction

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