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

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

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