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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Highway Engineering
In case of summit curves, the deviation angle will be maximum when

an ascending gradient meets with a descending gradient
an ascending gradient meets with another ascending gradient
an ascending gradient meets with a level surface
a descending gradient meets with another descending gradient

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