|Describes features used to slow down traffic.|
|Used on these elements|
|Documented values: 2|
|Tools for this tag|
- See on Wikipedia
Traffic calming consists of engineering and other measures put in place on roads for slowing down or reducing motor-vehicle traffic as well as to improve safety for pedestrians and cyclists.
How to map
Add one of the following to either a segment of highway=* or to a node along the highway:
- General / unspecified traffic calming device
Things that cause vehicles to "rise and fall"
- Short bump - length (in direction of travel) about 30 cm or shorter. Spans the entire width of the road, but can have cuts and small gaps left and right for cyclists. (see speed bump)
- Similar to a bump, but longer - total length usually 2-4 m (in direction of travel) (see speed hump)
- Designed as a long speed hump with a flat section in the middle. The flat section is long enough for all wheels of a passenger car to fit on that section simultaneously. Does not slow as much as a hump and is usually used on roads with residential speed limit. It is known as flat top hump or raised pedestrian crossing. (see speed table). Often it is a combination of traffic calming and crossing for pedestrians, so if it is there should be added highway=crossing in case it is mapped as a node.
- A hump with spaces between or several multiple rectangular humps aligned across the road. This allows emergency vehicles, buses (due to their wider axle) and bicycles to pass through without slowing down. (see speed cushion)
- Multiple very low bumps (few cm at most) spaced few meters apart spanning the entire width of the road. Does not limit speeds as such, but are very noticeable to the driver as they generate noise and shake the car mildly. Not to be confused with the similar device used to alert drivers when they drift from their lane. (see rumble strips)
- A dip is a traffic calming feature used to slow traffic and channeling water, that works for depression. Its dimensions are similar to bump.
Things that cause vehicles to deviate left and/or right
- A deliberate sharp curve or series of curves street you have to drive round. The road may also be reduced in width to allow only one vehicle at a time. Called a driveway link in Australia. (see chicane)
- Narrowed road, sometimes signed as pinch points
- See also priority=* to indicate which direction of traffic has priority at the choker (if any).
- An island is a small area that temporarily separates two different directions of traffic. See also crossing=island and landuse=traffic_island for islands intended for pedestrians crossing the road.