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

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

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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
to designate traffic lanes
in roadways meant for two way traffic

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Highway Engineering
The effect of grade on safe overtaking sight distance is

to decrease it on descending grades and to increase it on ascending grades
to increase it on descending grades and to decrease it on ascending grades
to increase it on both descending and ascending grades
to decrease it on both descending and ascending grades

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