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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Highway Engineering
The sequence of four stages of survey in a highway alignment is

reconnaissance, map study, preliminary survey and detailed survey
preliminary survey, map study, reconnaissance and detailed survey
map study, reconnaissance, preliminary survey and detailed survey
map study, preliminary survey, reconnaissance and detailed survey

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