Key:priority

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Public-images-osm logo.svg priority
Vienna Convention road sign B6.svg
Description
Traffic priority for narrow parts of roads, e.g. narrow bridges. Edit or translate this description.
Group: Highways
Used on these elements
may be used on nodesmay be used on waysshould not be used on areasshould not be used on relations
Wikidata
Status: in use

Single lane traffic direction priority

Where traffic is narrowed to a single lane due to an obstacle such as a narrow bridge or a traffic calming measure there is sometimes a sign either side of the restriction indicating that one direction of traffic has priority over the other. These signs are registered in the Vienna convention on road signs and signals as these:

Priority for oncoming traffic (B5) Priority over oncoming traffic (B6)
Vienna Convention road sign B5-V1.svg Vienna Convention road sign B6.svg

It is useful to record this information in OpenStreetMap so that routing algorithms could take account of it in determining the delay based on travel direction.

Applies to: Ways (typically highway=*) and Nodes: (typically traffic_calming=choker)

  • Use priority=forward for priority in the same direction as a way's ordered set of nodes.
  • Use priority=backward for priority in the opposite direction to a way's ordered set of nodes.