Tag:traffic_calming=dynamic_bump
 traffic_calming = dynamic_bump
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A dynamic traffic calming whose impact depends on the drivers actual speed. 
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| Group: highways |
| Used on these elements |
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| Useful combination |
Status: approved
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This tag should be used for all traffic calming devices which cause vertical deviation 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.
Examples
Lowered hatch
The drivers 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 viscous ("from water to honey").
see this article
Tagging
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.)