Highway Engineering
When the speed of traffic flow becomes zero,then

traffic density and traffic volume both attain maximum value
traffic density attains maximum value whereas traffic volume becomes zero
traffic density and traffic volume both become zero
traffic density becomes zero whereas traffic volume attains maximum value

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

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

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