Overpass

Overpass in East Potomac Park, Washington, D.C.

Sandgate Flyover, where 2 main railway lines pass over two dedicated coal lines

Pedestrian overpass, I-64, St. Louis, Missouri. This overpass is located at the St. Louis Science Center.

An overpass (called a flyover in the UK and most Commonwealth countries) is a bridge, road, railway or similar structure that crosses over another road or railway.

In North America, a flyover is a high-level overpass, built above main overpass lanes, or a bridge built over what had been an at-grade intersection. Traffic engineers usually refer to the latter as a grade separation. A flyover may also be an extra ramp added to an existing interchange, either replacing an existing cloverleaf loop (or being built in place of one) with a higher, faster ramp that bears left. Such a ramp may be built as a right or left exit.

A pedestrian overpass allows pedestrians safe crossing over busy roads without impacting traffic.

[edit] See also

• Footbridge
• Skyway
• Pedestrian separation structure

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