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An "Overpass" is a structure where the majority of the traffic travels 'over' something else (a river, another road). A "Underpass" is where the majority of the traffic travels 'under' another structure.

A structure cannot be both.

A 'grade separation' is where an grade of one feature changes to accommodate another feature (rail road, another road).

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Q: What is the different between an overpass and an underpass?
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