From OpenStreetMap Wiki
Jump to navigation Jump to search
Public-images-osm logo.svg oneway = alternating
Oneway that changes its direction often Show/edit corresponding data item.
Group: restrictions
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Useful combination
See also
Status: de facto

This tag is used for roads that alternate between different directions regularly and often. Its main usage is on narrow bridges or at road construction sites. Often there are traffic lights at both ends regulating traffic flow.

This tag is only used for roads that change direction often (usually several times per hour) and regularly. Use oneway=reversible and Conditional restrictions as needed for roads that only change direction at specified times. If you are not sure whether to use oneway=reversible or oneway=alternating, ask yourself: When I need to use this road but traffic is traveling in the opposite direction, would I wait for the direction to change to enter the road (oneway=alternating) or would I use a different route (oneway=reversible)?

Routing engines are encouraged to route over this type of oneway independent of direction but use a heavy penalty when calculating the travel time to allow for possible waiting times.

Tags to use in combination

  • lanes=* - Total number of traffic lanes available for motorised traffic
  • priority=* - if the current direction is controlled by give-way signs. If traffic lights are used, then this tag is not needed.