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Public-images-osm logo.svg traffic_calming = island
A traffic calming island is a structure for the purpose of slowing down traffic, temporarily separating two different traffic directions. Edit this description in the wiki page. Edit this description in the data item.
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 (except multipolygon relations)
See also
Status: de factoPage for proposal

A traffic calming island is a structure for the purpose of slowing down traffic, separating at least two lanes of a highway for a short distance[1]. The width of the island is usually under a few meters. The island doesn't necessarily have to have a right-of-way indicator. The area of the island itself can be drawn using area:highway=traffic_island, but the traffic calming feature is meant to be used as a point on the way itself, or tagged on part of the way.

Note that as of mid April 2023, only about 3% of pedestrian crossings with pedestrian refuges (crossing:island=yes or the deprecated crossing=island) are also tagged with traffic_calming=island. So as a data consumer, if you are looking for all traffic islands, you should look for crossings with the tags mentioned, too.

How to map

For an island between two lanes of a carriageway, either:

Tags to use in combination

For traffic calming islands drawn as a node node:

  • direction=* - if an island is made to only slow down traffic in one direction

For traffic islands drawn as an area area using area:highway=traffic_island:


  • One possible rendering may be as a small hollow dot in the middle of a node, or a small hollow line in the middle of a way. When creating software, these choices are yours.
  • None, currently, by the osm-carto layer.
  • iD and JOSM editors represents this tag with an icon: Example-object
  • OsmAnd has a possibility to alert drivers of incoming traffic_calming=* features, a warning icon with a speed bump is shown[2].
If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!

See also



  1. It's not clear yet if this tag is to be used for solid and/or painted islands. As has been pointed out here (Proposed_features/Road_divider_areas, Feb 2022) and here (What’s the traffic_calming=island area?, Feb 2023).
  2. OsmAnd Docs - Alert types -https://osmand.net/docs/user/widgets/nav-widgets/#alert-types