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

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Highway Engineering
Centre line markings are used

to designate proper lateral placement of vehicles before turning to different directions
to indicate that overtaking is not permitted
to designate traffic lanes
in roadways meant for two way traffic

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