What is another word for underpass?
Pronunciation: [ˌʌndəpˈas] (IPA) 
An underpass is typically a passage or a tunnel that goes underneath an obstacle such as a road, railway track, or a river. Other words that can be used synonymously with the term underpass include subway, subterranean passage, underground walkway, pedestrian underpass, pedestrian subway, and tunnel. A subway is primarily used to describe an underground railway system or urban rapid transit system. A subterranean passage is a term used to describe any path that goes underground. An underground walkway or pedestrian subway is often found in cities as a means of crossing busy streets without interfering with vehicular traffic. Finally, tunnels are generally used to describe an underground passage that is constructed for transportation or utility purposes.
