An underpass is a type of structure that allows pedestrians, cyclists, or vehicles to pass beneath a road, railway, or other obstacles. These passages are often used to improve safety by separating traffic flows, reducing the risk of accidents at busy intersections. Underpasses can be found in urban areas, parks, and near schools, providing a safe route for people to cross busy streets. Underpasses can vary in design, including simple tunnels or more elaborate structures with lighting and ventilation. They are often constructed using concrete or steel and may feature artwork or landscaping to enhance their appearance. Traffic safety, urban planning, and infrastructure are key considerations in the design and placement of underpasses.