Highway Engineering
The provision of traffic signals at intersections

increases right angled and rear end collisions
reduces right angled collisions but may increase 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
Length of a vehicle affects

clearance to be provided under structures such as overbridges, under-bridges etc.
width of traffic lanes
width of shoulders and parking facilities
extra width of pavement and minimum turning radius

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