Highway Engineering
Nagpur road plan formula were prepared by assuming

rectangular or block road pattern
radial or star and circular road pattern
radial or star and block road pattern
radial or star and grid road pattern

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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 less than 500 vehicles per hour
when traffic volume is more than 5000 vehicles per hour

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