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

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

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Highway Engineering
The direct interchange ramp involves

diverging to the right side and merging from left
diverging to the left side and merging from right
diverging to the right side and merging from right
diverging to the left side and merging from left

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