Highway Engineering
The entrance and exit curves of a rotary have

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

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Highway Engineering
Length of a vehicle affects

extra width of pavement and minimum turning radius
width of traffic lanes
clearance to be provided under structures such as overbridges, under-bridges etc.
width of shoulders and parking facilities

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