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

revolving
skidding
slipping
turning

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Highway Engineering
A traffic rotary is justified where

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

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