Highway Engineering
The critical combination of stresses for corner region in cement concrete roads is

Load stress + warping stress + frictional stress
Load stress + warping stress frictional stress
Load stress + warping stress
Load stress + frictional stress

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

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