An underpass is a passage or tunnel that allows one road or pathway to go beneath another, usually a highway or railroad. It is designed to keep traffic flowing smoothly by separating different levels of transportation, allowing vehicles or pedestrians to move without stopping for intersections. Underpasses are commonly used in busy areas to reduce congestion and improve safety by avoiding crossing roads. They can be found in cities, along highways, or at locations where roads need to pass under elevated structures.

What is an "underpass"?

“underpass”的英语定义和含义

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