Highway Engineering
A traffic rotary is justified where

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

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Highway Engineering
The entrance and exit curves of a rotary have

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