Highway Engineering
The entrance and exit curves of a rotary have

equal radii and equal widths of pavement
equal radii but pavement width is more at entrance than at exit curve
different radii and different widths of pavement
equal pavement widths but radius is more at entrance curve than at exit curve

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

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