Highway Engineering
The provision of traffic signals at intersections

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

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Highway Engineering
For a constant value of coefficient of lateral friction, the value of required super-elevation increases with

decrease in speed and with increase in radius of curve
increase in both speed and radius of curve
increase in speed and with decrease in radius of curve
decrease in both speed and radius of curve

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