Highway Engineering
With increase in speed of the traffic stream, the maximum capacity of the lane

first decreases and then increases after reaching a minimum value at optimum speed
decreases
increases
first increases and then decreases after reaching a maximum value at optimum speed

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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 less than 500 vehicles per hour
when traffic volume is more than 5000 vehicles per hour
space is limited and costly

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