Highway Engineering
In case of summit curves, the deviation angle will be maximum when

an ascending gradient meets with another ascending gradient
a descending gradient meets with another descending gradient
an ascending gradient meets with a descending gradient
an ascending gradient meets with a level surface

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Highway Engineering
The provision of traffic signals at intersections

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

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