<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> In transport engineering nomenclature, a counterflow lane or contraflow lane is a lane in which traffic flows in the opposite direction of the surrounding lanes . </P> <P> Contraflow lanes are often used for bicycles or bus rapid transit on what are otherwise one - way streets . In a sample configuration for buses, a street might have four lanes: the outermost lanes are reserved for buses in both directions, while the center two lanes are available for general traffic in only one direction . Thus, the street functions as two - way for buses, but one - way for all other vehicles . </P>

Whats the difference between contraflow and with flow