Highway Engineering
Nagpur road plan formula were prepared by assuming

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

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Highway Engineering
The provision of traffic signals at intersections

reduces right angled collisions but may increase rear end collisions
reduces rear end collisions but may increase right angled collisions
reduces right angled and rear end collisions
increases right angled and rear end collisions

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

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