Highway Engineering
In case of hill roads, the extra widening is generally provided

fully on the outer side of the curve
fully on the inner side of the curve
one-fourth on inner side and three-fourth on outer side of the curve
equally on inner and outer sides of the curve

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Highway Engineering
A traffic rotary is justified where

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

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