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

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Highway Engineering
A traffic rotary is justified where

when traffic volume is more than 5000 vehicles per hour
space is limited and costly
when traffic volume is less than 500 vehicles per hour
number of intersecting roads is between 4 and 7

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