Editing One-way pair (section)

==Description==
In the context of roads, a one-way pair consists of two [[one-way traffic|one-way streets]] whose flows combine on one or both ends into a single [[two-way street]]. The one-way streets may be separated by just a single block, such as in a [[grid plan|grid network]], or may be spaced further apart with intermediate parallel roads. 

One use of a one-way pair is to increase the vehicular capacity of a major route through a developed area such as a [[central business district]]. If not carefully treated with other traffic calming features, the benefit in vehicular capacity is offset by a potential for increased road user deaths, in particular people walking and biking.<ref>{{cite news|url=https://citylimits.org/2015/12/22/to-stop-pedestrian-deaths-we-have-to-change-the-way-we-build-our-streets|title=To Stop Pedestrian Deaths NYC Must Change How it Builds Streets}}</ref> A one-way pair can be created by converting segments of two-way streets into one-way streets, which allows lanes to be added without widening.{{citation needed span|text=It also allows easier creation of a [[green wave]] by adjusting [[traffic light]]s on the through route, because strict left turn phases are no longer required at each intersection.|date=June 2017}}

On occasion, "couplet" has been applied specifically to the point where the one-way streets and the two-way street meet, rather than the paired one-way streets themselves.<ref name=intrs89>{{cite news|url=https://news.google.com/newspapers?id=29ctAAAAIBAJ&sjid=v9AFAAAAIBAJ&pg=5004%2C878655|newspaper=Idahonian|location=Moscow|last=McCann|first=Sheila R. |title=Interest stirs again for long-delayed interchange on U.S. 95|date=June 23, 1989|page=1A}}</ref>

Flows on a one-way pair may follow the [[Right- and left-hand traffic|traffic handedness convention]] of the locale, or may be switched. Following the convention allows a one-way pair to be more easily integrated into an existing network of two-way streets, as a single two-way street is effectively split into the two sides of the pair, as in the diagram below:

{|table border=0 cellspacing=0
! (rejoin) || (one-way pair) || (split)
|-
| ||/ ← ← ← ← ← ← ← /|| 
|-
| ← ← ← ||/ ← ← ← ← ← ← ← /|| ← ← ←
|-
| → → → ||/ → → → → → → → /|| → → →
|-
| ||/ → → → → → → → /|| 
|}