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

skidding
slipping
revolving
turning

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Highway Engineering
When the speed of traffic flow becomes zero,then

traffic density attains maximum value whereas traffic volume becomes zero
traffic density and traffic volume both become zero
traffic density and traffic volume both attain maximum value
traffic density becomes zero whereas traffic volume attains maximum value

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