Highway Engineering
The direct interchange ramp involves

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

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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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