Highway Engineering
If the average center to center spacing of vehicles is 20 meters, then the basic capacity of a traffic lane at a speed of 50 kmph is

2500 vehicles per hour
2000 vehicles per hour
2500 vehicles per day
1000 vehicles per hour

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

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