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

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

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Highway Engineering
A traffic rotary is justified where

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

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