Highway Engineering
On a single lane road with two way traffic, the minimum stopping sight distance is equal to

half the stopping distance
three times the stopping distance
two times the stopping distance
stopping distance

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Highway Engineering
A traffic rotary is justified where

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

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