Key:traffic_signals:direction

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Public-images-osm logo.svg traffic_signals:direction
Osm element key.svg
Group: Highway
Used on these elements
may be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations
Useful combination

highway=traffic_signals

Status: Unspecified

traffic_signals:direction=* is used with highway=traffic_signals to indicate the direction of travel affected by the traffic signals.

This tag only applies for nodes that are part of a way. For traffic signal nodes placed at their real position next to the road, use direction=* with cardinal directions or angles as the value.

Description

Complex junctions where multiple crossing nodes are tagged with highway=traffic_signals can cause routing algorithms to interpret two or more individual traffic signals where in reality traffic signals only apply once to crossing traffic. This can be overcome by tagging the direction of travel affected by the traffic signals.

Using this information routing algorithms can better determine how traffic signals at a junction affect journey time and provide better weighted route choices.

Tagging

Key Value Element Comment
traffic_signals:direction forward Node Only traffic which passes in the same direction as the way is affected.
traffic_signals:direction backward Node Only traffic which passes in the opposite direction as the way is affected.

Note that this tagging is ambiguous in case the node belongs to more than one highway=*! For this reason, use the traffic_signals:direction=* tag only on nodes which are part of exactly one highway. Avoid junction nodes and nodes between two ways as well (where they have been split, but are connected by a node). If in doubt, better simply insert a new node into the way which can be freshly tagged.

See also