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A one-way pair, one-way couple, or just couplet is a pair of parallel, usually one-way streets that carry opposite directions of a signed route or major traffic flow, or sometimes opposite directions of a bus or streetcar route.
The usual purpose is to provide higher capacity by increasing the number of lanes in each direction. It also allows easier creation of a green wave by adjusting traffic lights on the through route, because fewer phases are needed at each intersection.
On a one-way pair, traffic usually flows the same way as on a normal divided highway, though occasionally flow is switched.
See also
- Directional running, the equivalent for rail transport
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