Overpass

[2] In North American usage, a flyover is a high-level overpass, built above main overpass lanes, or a bridge built over what had been an at-grade intersection.

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 eventually bears left, but may be built as a right or left exit.

Depending upon design, traffic may flow in all directions at or near open road speeds (when not congested).

Rapid transit systems use complete grade separation of their rights of way to avoid traffic interference with frequent and reliable service.

Railroads also use balloon loops and flying junctions instead of flat junctions, as a way to reverse direction and to avoid trains conflicting with those on other tracks.

Highway overpass in Greensboro, North Carolina
Overpass crossing multiple railway lines and roads in Kyoto , Japan
In Hong Kong , an overpass is built along a street or road, like Hill Road Flyover , to alleviate traffic between two main roads.