Highway Engineering
In highway construction on super elevated curves, the rolling shall proceed from

centre towards the sides
lower edge towards the upper edge
sides towards the centre
upper edge towards the lower edge

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

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

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