Highway Engineering
The fundamental factor in the selection of pavement type is

type and intensity of traffic
availability of funds for the construction project
subgrade soil and drainage conditions
climatic condition

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Highway Engineering
The provision of traffic signals at intersections

reduces 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
increases right angled and rear end collisions

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