Highway Engineering
In highway construction, rolling starts from

Any of the above
Center and proceed to sides
One side and proceed to other side
Sides and proceed to center

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Highway Engineering
A traffic rotary is justified where

space is limited and costly
when traffic volume is less than 500 vehicles per hour
number of intersecting roads is between 4 and 7
when traffic volume is more than 5000 vehicles per hour

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

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