|Provide a classification scheme regarding the physical usability of a way for wheeled vehicles.|
|Used on these elements|
|Tools for this tag|
smoothness provides a classification scheme regarding the physical usability of a way for wheeled vehicles, particularly regarding surface regularity/flatness.
Usability by a particular type of vehicle means that the vehicle can traverse the route without significant risk of damage (e.g. to vehicle undercarriage/drivetrain) or injury (e.g. by falling).
The tag can be applied to all driveable ways and areas: highway=*, parking areas, beaches, ...
tracktype=* is also an important surface property and refers to surface firmness, regardless of shape.
surface=* refers to surface material and sometimes to material structure. It may suggest a surface smoothness sometimes, but because the same surface material/structure can exhibit various shapes, it is still advisable to add smoothness=*.
|smoothness||excellent||(thin_rollers) roller blade, skate board and all below|
|smoothness||good||(thin_wheels) racing bike and all below|
|smoothness||intermediate||(wheels) city bike, sport cars, wheel chair, Scooter and all below|
|smoothness||bad||(robust_wheels) trekking bike, normal cars, Rickshaw and all below|
|smoothness||very_bad||(high_clearance) Car with high clearance, light-duty off road vehicles|
|smoothness||horrible||(off_road_wheels) heavy-duty off road vehicles and all below|
|smoothness||very_horrible||(specialized_off_road_wheels) tractor, ATV, tanks, trial, Mountain bike and all kind of off-highway vehicles (see also mtb:scale=*)|
|smoothness||impassable||No wheeled vehicle (see also sac_scale=*)|
Please note: Photos are examples ONLY ! Because the smoothness of a way should be assessed solely based on whether the way is usable by the vehicles mentioned above. This is my whole point: as a user of a certain road or path I am only interested whether I can drive on this road or not.
This table is a wiki template with a default description in English. Editable here.
For use in developing countries the HDM model is using some values of smoothness=* to help define road quality. see: Humanitarian_OSM_Tags/smoothness
It is clear from discussion on the mailing lists that a major part of the community does not like this key, based on the guideline of Verifiability. Please have a look at the discussion page and the mailing-list (thread starting at , contiued at ) and make up your own mind. As always on OSM you are free to use the keys you like in the way you like! Use the page Talk:Proposed features/Smoothness for the controversy details. Please help improving the tagging of roads by posting constructive comments to Proposed_features/surface_unification.
- The key could be made more verifiable changing the values to thin_rollers, thin_wheels, wheels, robust_wheels, high_clearance, off_road_wheels and specialized_off_road_wheels. (See Proposed_features/usability) for a transition.)