Highway Engineering
The desirable length of overtaking zone as per IRC recommendation is equal to

five times the overtaking sight distance
three times the overtaking sight distance
two times the overtaking sight distance
overtaking sight distance

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

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

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