Overpass

Overpass
7 various overpasses in Spain near Barcelona
Overpass in East Potomac Park, Washington, D.C.
Sandgate Flyover, New South Wales, where two main railway lines pass over two dedicated coal lines
Flyover on Keelung Road in Taipei, Taiwan
New York State Thruway overpass

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 and underpass together form a grade separation.[1]

Contents

North America

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 cloverleaf or partial cloverleaf contains some 270 degree loops, slowing traffic and such loops are difficult to construct with more than multiple lanes. Where all such turns are replaced with flyovers (perhaps with some underpasses) only 90 degree turns are needed, and there may be four or more distinct levels of traffic. Depending upon design, traffic may flow in all directions at or near open road speeds (when not congested). For more examples see Freeway interchange.

Pedestrian

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

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

First railroad flyover

The world's first railroad flyover was constructed in 1843 by the London and Croydon Railway at Norwood Junction railway station to carry its atmospheric railway vehicles over the Brighton Main Line.[2]

See also

References

  1. ^ Henry K. Evans (1950). "Read the ebook Traffic engineering handbook by Institute of Traffic Engineers". ENGINEERING HANDBOOK, Second Edition 1950. New Haven, Connecticut: Institute of Traffic Engineers. http://www.ebooksread.com/authors-eng/institute-of-traffic-engineers/traffic-engineering-handbook-hci/page-46-traffic-engineering-handbook-hci.shtml. Retrieved 2010-10-09. 
  2. ^ 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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Look at other dictionaries:

  • Overpass — O ver*pass , v. t. [imp. & p. p. {Overpassed}; p. pr. & vb. n. {Overpassing}.] [Cf. {Surpass}.] [1913 Webster] 1. To go over or beyond; to cross; as, to overpass a river; to overpass limits. [1913 Webster] 2. To pass above; of roadways and other… …   The Collaborative International Dictionary of English

  • overpass — o ver*pass , n. A road or other pathway which passes over another road, railroad, or other path; as, he stopped on the street under the railroad overpass. [PJC] …   The Collaborative International Dictionary of English

  • Overpass — O ver*pass , v. i. To pass over, away, or off. [1913 Webster] …   The Collaborative International Dictionary of English

  • overpass — index overstep, surmount, transcend Burton s Legal Thesaurus. William C. Burton. 2006 …   Law dictionary

  • overpass — (n.) stretch of road that passes over another, 1929, American English, from OVER (Cf. over) + PASS (Cf. pass) (v.) …   Etymology dictionary

  • overpass — ► NOUN ▪ a bridge by which a road or railway line passes over another …   English terms dictionary

  • overpass — [ō′vər pas΄; ] for v. [ ō΄vər pas′] n. ☆ a bridge or other passageway over a road, railway, etc. vt. Now Rare 1. to pass over, across, or through 2. to surpass; outdo 3. to overlook; ignore …   English World dictionary

  • overpass — n. /oh veuhr pas , pahs /; v. /oh veuhr pas , pahs /, n., v., overpassed or overpast, overpassing. n. 1. a road, pedestrian walkway, railroad, bridge, etc., crossing over some barrier, as another road or walkway. v.t. 2. to pass over or traverse… …   Universalium

  • overpass — n. (esp. AE) an overpass over (an overpass over a road) (BE has flyover) * * * [ˌəʊvə pɑːs] (esp. AE) an overpass over (BE has flyover; an overpass over a road) …   Combinatory dictionary

  • overpass — flyover flyover n. 1. the upper level of a crossing of two highways at different levels; called in the United States an {overpass}; as, an overpass is called a flyover or a flypast in England. [Brit.] Syn: overpass, flypast. [WordNet 1.5] 2. a… …   The Collaborative International Dictionary of English

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