Proposed features/Tag:traffic calming=dynamic bump

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Status: Proposed (under way)
Proposed by: Klumbumbus
Tagging: traffic_calming=dynamic_bump
Applies to: node, way
Definition: A dynamic traffic calming whose impact depends on the drivers actual speed.
Drafted on: 2019-08-22
Proposed on: 2019-08-22
RFC start: 2019-08-28


Invention of the tag traffic_calming=dynamic_bump. Add it to this wiki. Retag current osm objects (see below).


A new type of traffic calming devices was invented. It is in use already at least in Sweden and Canada and planned in Germany. This type cannot be described properly with the current values listed on traffic_calming=*.

This tag should be used for all traffic calming devices where drivers who adhere to the speed limit are not or only a bit affected by the calming device while drivers who drive faster than the speed limit were affected as intended.

Some devices have a feature that emergency vehicles can deactivate the device so they can pass the device faster without being affected.


Lowered hatch

The driver speed is measured (e.g. by radar) and depending on the speed a hatch is lowered into the road surface. One example is the Actibump (brand name).

Leaking air

A bump is made of rubber and filled with air which can leak when driving over it slowly. If you drive too fast a valve closes and keeps the air within the bump.

see this article (brand name "TransCalm")

Non-Newtonian fluid

A bump is made of rubber and filled with a Non-Newtonian fluid. Driving faster makes the fluid more viskose ("from water to honey").

see this article


Similar to the other traffic_calming values.

Optional maxspeed=* can be added to the object. This of course should be the legal speed limit at the device location, not the actual speed the device is activated. (This could possibly be configured by operator of the device different from the legal speed limit, e.g. a little bit higher, or the device could even be dynamic in the spirit of: little too fast -> little impact, much too fast -> big impact.)

Applies to

node Nodes and way Ways similar to the other traffic_calming values.


Up to the renderer. Possibly similar to the other traffic_calming values.

Features/Pages affected

After the proposal has been approved the following actions will be done:

  • Add the tag to the traffic_calming=* page at "By causing vertical deviation"
  • Create traffic_calming=dynamic_bump.
  • Adapt the tagging of the known dynamic_bump objects in the osm database. As these are only a few this will be done manually by hand with JOSM. As of 2019-08-28 these are:
  1. these 6 nodes in Linköping in Sweden (which are currently tagged with the brand name as tag value which is not a good solution).

External discussions


Please comment on the discussion page.