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

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

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

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