flyover

A flyover is an elevated road or bridge that passes above another road, railway, or obstacle to provide a grade-separated crossing for vehicles. It is typically part of an urban or suburban transportation network and is designed to improve traffic flow by allowing through-traffic to bypass intersections and surface-level congestion.

A flyover may be a single-span structure or composed of multiple spans supported by piers. Construction materials commonly include reinforced concrete and steel. Decks are usually supported by girders and may be cast in place or assembled from precast segments. Ramps or slip roads connect surface streets to the elevated roadway, creating an interchange rather than a simple bridge. Some flyovers are continuous structures formed as viaducts.

Erection involves considerations such as land acquisition, alignment, seismic and wind resistance, drainage, and long-term maintenance. Expansion joints and bearings accommodate movement due to temperature changes and traffic loads. Flyovers are used to reduce conflict points, minimize interruptions to through traffic, and facilitate high-volume corridors. Environmental and social impacts are addressed in planning and design.

In different regions, the term flyover has specific usage. In India and parts of Asia, flyover commonly refers to elevated highways or bridges, whereas in the United States and most of Europe the term overpass or elevated highway is used. The word derives from the ability of the structure to “fly over” lower traffic. Notable examples include major urban interchanges and ring-road projects that incorporate flyovers to separate levels of traffic.