Highway Engineering
A traffic rotary is justified where

when traffic volume is less than 500 vehicles per hour
when traffic volume is more than 5000 vehicles per hour
number of intersecting roads is between 4 and 7
space is limited and costly

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

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

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

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Highway Engineering
Centre line markings are used

to indicate that overtaking is not permitted
to designate proper lateral placement of vehicles before turning to different directions
in roadways meant for two way traffic
to designate traffic lanes

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