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One-way pair
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One-way pair
A one-way pair, one-way couple, or couplet refers to that portion of a bi-directional traffic facility – such as a road, bus, streetcar, or light rail line – where its opposing flows exist as two independent and roughly parallel facilities.
In the context of roads, a one-way pair consists of two 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 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. 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.It also allows easier creation of a green wave by adjusting traffic lights on the through route, because strict left turn phases are no longer required at each intersection.[citation needed]
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.
Flows on a one-way pair may follow the 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:
International research has found that there are several disadvantages to one-way pairs including:
The American Association of State Highway and Transportation Officials suggests converting two-way to one-way operation in situations where an urban street has too many pedestrian-vehicle conflicts.
One-way streets benefit drivers, but two-way streets benefit everyone else. They can improve air quality, safety for cyclists and pedestrians, and promote patronage of local businesses.
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One-way pair
A one-way pair, one-way couple, or couplet refers to that portion of a bi-directional traffic facility – such as a road, bus, streetcar, or light rail line – where its opposing flows exist as two independent and roughly parallel facilities.
In the context of roads, a one-way pair consists of two 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 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. 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.It also allows easier creation of a green wave by adjusting traffic lights on the through route, because strict left turn phases are no longer required at each intersection.[citation needed]
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.
Flows on a one-way pair may follow the 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:
International research has found that there are several disadvantages to one-way pairs including:
The American Association of State Highway and Transportation Officials suggests converting two-way to one-way operation in situations where an urban street has too many pedestrian-vehicle conflicts.
One-way streets benefit drivers, but two-way streets benefit everyone else. They can improve air quality, safety for cyclists and pedestrians, and promote patronage of local businesses.