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

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

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Highway Engineering
A traffic rotary is justified where

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

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