What is another word for under-passes?
Pronunciation: [ˌʌndəpˈasɪz] (IPA) 
Under-passes are a type of roadway structure that allows for transportation to pass beneath a surface-level obstacle such as a highway or railway track. There are several different synonyms that can be used to describe these types of structures, including undercrossings, subways, tunnels, and underbridges. Each of these words can be used interchangeably to refer to any type of roadway structure that passes beneath something else. Undercrossings and subways are often used to refer to pedestrian walkways, while tunnels and underbridges are typically used to describe larger, vehicular roadways. Regardless of the term used, under-passes are an important part of modern infrastructure, ensuring the smooth flow of transportation around obstacles and through urban areas.
