Highway Engineering
The attainment of super elevation by rotation of pavement about the inner edge of the pavement

is preferable in steep terrain
avoids the drainage problem in flat terrain
results in balancing the earthwork
does not change the vertical alignment of road

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

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

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