An overpass (called a flyover in the United Kingdom 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.Stack interchanges are made up of many overpasses.

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.

William "Bill" Flynn (December 13, 1948 - July 11, 2007) was a South African actor and comedian, perhaps best known for playing Tjokkie.

Flynn was born William Flynn in Cape Town and matriculated from Plumstead High School. He went to the UCT drama school and was a founder member of the Space theatre in Cape Town.

Flynn was perhaps best known for his portrayal of Tjokkie, a character that he portrayed as a wise-cracking, beer drinking rugby union fan. Flynn had won 13 best actor awards, including the Dublin Critics and Golden Entertainer Awards. Among these were:

His film writing also won him a Best Screenplay award for Saturday Night at the Palace. His karate comedy movie Kill and Kill Again was a top box office hit in America. Bill's movie of Saturday Night at The Palace won several Vita Film Awards, a Best Actor award at the Italian Taormina Film festival as well as a Merit Award at the Los Angeles Film Festival.

He was a longtime friend and collaborator of the actor and playwright Paul Slabolepszy.