Highway Engineering
When the path travelled along the road surface is more than the circumferential movement of the wheels due to rotation, then it results in

slipping
skidding
revolving
turning

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Highway Engineering
The entrance and exit curves of a rotary have

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

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