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

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

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Highway Engineering
When the speed of traffic flow becomes zero,then

traffic density and traffic volume both become zero
traffic density and traffic volume both attain maximum value
traffic density attains maximum value whereas traffic volume becomes zero
traffic density becomes zero whereas traffic volume attains maximum value

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