Highway Engineering
The provision of traffic signals at intersections

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

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

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