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

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

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Highway Engineering
The direct interchange ramp involves

diverging to the left side and merging from left
diverging to the left side and merging from right
diverging to the right side and merging from left
diverging to the right side and merging from right

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