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Sandgate Flyover, where two 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. An overpass structure is one that carries a higher capacity road above a lower capacity road, whereas a structure that permits a lower capacity road to travel above a larger capacity road is an underpass.[citation needed] Capacity is determined as either the number of lanes of travel provided or measured traffic count. In instances of actual or perceived equality between the traffic flows, the term structure can be used.[citation needed]

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.

The world's first flyover was constructed in 1842 by the London and Croydon Railway at Norwood Junction railway station to carry its atmospheric railway vehicles over the Brighton Main Line.[1]

See also

References

  1. ^ Turner, J.T. Howard (1977). The London Brighton and South Coast Railway 1. Origins and formation. London: Batsford. pp. 249. ISBN 071340275X. 
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