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

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

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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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