Key:priority

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Public-images-osm logo.svg priority
Vienna-convention-sign-B6.svg
Description
Traffic priority for narrow parts of roads, e.g. narrow bridges.
Group: Highways
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations
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 Wikipedia-16px.png Vienna convention on road signs and signals as these:

Priority for oncoming traffic (B5) Priority over oncoming traffic (B6)
Vienna-convention-sign-B5.svg Vienna-convention-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=*)

  • 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.