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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Highway Engineering
The provision of traffic signals at intersections

reduces rear end collisions but may increase right angled collisions
reduces right angled and rear end collisions
reduces right angled collisions but may increase rear end collisions
increases right angled and rear end collisions

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