Highway Engineering
With increase in speed of the traffic stream, the minimum spacing of vehicles

first increases and then decreases after reaching a maximum value at optimum speed
increases
first decreases and then increases after reaching a minimum value at optimum speed
decreases

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

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