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

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Highway Engineering
The direct interchange ramp involves

diverging to the left side and merging from left
diverging to the right side and merging from left
diverging to the left side and merging from right
diverging to the right side and merging from right

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