Highway Engineering
The diagram which shows all important physical conditions of an accident location like roadway limits, bridges, trees and all details of roadway conditions is known as

collision diagram
condition diagram
spot maps
pie chart

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

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