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Overpass

 
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An overpass (called a flyover in the UK
United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom , the UK or Britain,is a sovereign state located off the northwestern coast of continental Europe....
 and most Commonwealth
Commonwealth of Nations

The Commonwealth of Nations, also known as the Commonwealth or the British Commonwealth, is an intergovernmental organization of fifty-three independent member states....
 countries) is a bridge
Bridge

A bridge is a structure built to span a gorge, valley, road, Rail tracks, river, body of water, or any other physical obstacle, for the purpose of providing passage over the obstacle....
, road
Road

A road is an identifiable Road number, way or Trail between Location . Roads are typically smoothed, Pavement , or otherwise prepared to allow easy travel; though they need not be, and historically many roads were simply recognizable routes without any formal construction or Maintenance, repair and operations....
, railway or similar structure
Structure

Structure is a fundamental and sometimes intangible notion covering the recognition, observation, nature , and stability of patterns and relationships of entities....
 that crosses over another road or railway.






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Overpass 501x229
Pedestrian Overpass
An overpass (called a flyover in the UK
United Kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom , the UK or Britain,is a sovereign state located off the northwestern coast of continental Europe....
 and most Commonwealth
Commonwealth of Nations

The Commonwealth of Nations, also known as the Commonwealth or the British Commonwealth, is an intergovernmental organization of fifty-three independent member states....
 countries) is a bridge
Bridge

A bridge is a structure built to span a gorge, valley, road, Rail tracks, river, body of water, or any other physical obstacle, for the purpose of providing passage over the obstacle....
, road
Road

A road is an identifiable Road number, way or Trail between Location . Roads are typically smoothed, Pavement , or otherwise prepared to allow easy travel; though they need not be, and historically many roads were simply recognizable routes without any formal construction or Maintenance, repair and operations....
, railway or similar structure
Structure

Structure is a fundamental and sometimes intangible notion covering the recognition, observation, nature , and stability of patterns and relationships of entities....
 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. 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.

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
At-grade intersection

An at-grade intersection is a junction at which two or more transport axis cross at the same level ....
. Traffic engineers usually refer to the latter as a grade separation
Grade separation

Grade separation is the process of aligning a junction of two or more transport axes at different heights so that they will not disrupt the traffic flow on other transit routes when they cross each other....
. A flyover may also be an extra ramp added to an existing interchange, either replacing an existing cloverleaf
Cloverleaf interchange

A cloverleaf interchange is a two-level interchange in which left turns are handled by loop roads . To go left , vehicles first pass either over or under the other road, then turn right onto a one-way three-fourths loop ramp and merge onto the intersecting road....
 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
Pedestrian separation structure

A pedestrian separation structure is any structure that removes pedestrians from a vehicle roadway. This creates a road junction where vehicles and pedestrians do not interact....
 allows pedestrians safe crossing over busy roads without impacting traffic.

See also

  • Footbridge
    Footbridge

    A footbridge or pedestrian bridge is a bridge designed for pedestrians and in some cases cycling and equestrianism, rather than vehicle traffic....
  • Skyway
    Skyway

    In an urban area setting, a skyway, Footbridge#Catwalk, or skywalk is a type of pedway consisting of an Covered bridge or covered Foot bridge between two buildings....