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

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Highway Engineering
A traffic rotary is justified where

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

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

traffic density attains maximum value whereas traffic volume becomes zero
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

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