Highway Engineering
The shape of the camber, best suited for cement concrete pavements, is

straight line
elliptical
parabolic
combination of straight and parabolic

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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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