Highway Engineering
The shape of the camber, best suited for cement concrete pavements, is

combination of straight and parabolic
elliptical
straight line
parabolic

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Highway Engineering
A traffic rotary is justified where

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

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