Highway Engineering
The drain which is provided parallel to roadway to intercept and divert the water from hill slopes is known as

Cross drain
Side drain
Catch-water drain
Sloping drain

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

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