Highway Engineering
The function of an expansion joint in rigid pavements is to

Resist stresses due to expansion
Allow free expansion
Relieve warping stresses
Relieve shrinkage stresses

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Highway Engineering
A traffic rotary is justified where

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

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