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

turning
skidding
revolving
slipping

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Highway Engineering
In case of summit curves, the deviation angle will be maximum when

a descending gradient meets with another descending gradient
an ascending gradient meets with a descending gradient
an ascending gradient meets with another ascending gradient
an ascending gradient meets with a level surface

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