|Used on these elements|
|Status: in use|
|Tools for this tag|
|This is not a voted feature, the page documents actual usage and advices suggested use.
It is incorporating information from a related (and seemingly abandoned) proposal.
The goal of this tag is to mark obstacles which are not derived from the properties of the road (surface, material, width, etc.) but from its environment or local properties; similarly, marks places where a way (most often waterways) have environmental obstacles. This tag can be used in a navigation application to avoid areas or use parts of the road with lower priorities when calculate routes, similarly to bumps, ferries or non-free roads, but it can be used on paths for non-vehicles.
This tag is being used by HOT.
|Use only on already existing highway=* or waterway=*, since this is a property of the usability of the way. For separate ("wayless") obstacles please use the barrier=* key.|
This key has been proposed, but the most frequently used values are not covered by the proposal. Please help document what these values mean and where they come from.
|vegetation||221||Movement on route is hard due to the vegetation (shubs, dense grass, nettle, lianas etc.), movement is significantly slowed down or you have to move carefully.||highway||General|
|yes||117||undefined (or "other") environmental factors make moving on the route difficult||use a more specific tag||highway||General|
|fallen_tree||124||There is a big fallen tree that completely hinders passability, and you only can continue the path if you cross the tree (cross it above or below).||See #fallen_tree below.||highway||General|
|unevenness||33||To follow the trail you must use hands and it cannot be avoided.||see discussion||highway||General|
|precipice||17||There is an important precipice alongside the trail (at least one side) that your eyes can't avoid see if you look forward and you see the falling. There are a minimal risk of falling, but it's an important difficulty for people with dizziness. You can't move over away from the precipice and take out it of your visual field.||highway||General|
|heap||10||There is a large heap of material (soil, rock pile, rubbish heap, etc.) making the movement difficult.||highway||General|
|hole||10||There is a large hole or holes on the road making the movement difficult or dangerous by smaller vehicles.||highway||General|
OpenSeaMap use (obsolete)
|bridge||2320||(Old tagging scheme not used by OpenSeaMap)||bridge=*||waterway||OpenSeaMap|
|lock||695||(Old tagging scheme not used by OpenSeaMap)||lock=*, waterway=lock_gate||waterway||OpenSeaMap|
|?||(Old tagging scheme not used by OpenSeaMap)||barrier=* + access=no|
|line||476||(Old tagging scheme not used by OpenSeaMap)||?||waterway||OpenSeaMap|
|ferry||?||44||(Old tagging scheme not used by OpenSeaMap)||route=ferry||waterway||OpenSeaMap|
|drawbridge||24||(Old tagging scheme not used by OpenSeaMap)||bridge:movable=drawbridge||waterway||OpenSeaMap|
|tunnel||24||(Old tagging scheme not used by OpenSeaMap)||tunnel=*||waterway||OpenSeaMap|
If the obstacle is specific to a vehicle or usage:
|Heavy goods vehicles||obstacle:hgv=*|
|Pedestrians are not affected||obstacle=fallen_tree + obstacle:foot=no|
If you use the obstacle=* you can give more details about it by using
|obstacle_description=*||The short and precise description of the obstacle (eg. "nettle", "dug hole", "rubbish" [heap])|
In case mainly of vegetation it's possible that the obstacle only exists in summer and marking it seasonal doesn't really give much information to the tagging. Despite this some people prefer to show that the obstacle is known to be non-existant periodically:
|seasonal:obstacle=yes||The obstacle isn't permanent (see seasonal=*)|
- maxheight:physical=* (maxheight=* is the highest permitted vehicle height, and height=* is the height of an object!)
The obstacles are most often points so you should use them on a way node. When an obstacle is larger than approximately 5 meters (this is usually the lower bound of GPS sensitivity) you may use it on a way or area, but this preferably should be avoided.
Fallen trees are almost always nodes, unless it is a way continuously covered by large amounts of fallen trees (like a not cleaned narrow valley road). When a tree crosses multiple ways use multiple way nodes instead of a "tree way" line; if it's a tree which could be used as a way please use highway=path + surface=wood instead. Do not use this tagging on "fresh" or "temporary" fallen trees; if a tree is visibly there for years or you reasonably expect it to stay there for years to come then tag it, but try not to tag trees which will be cleaned up (or cut) soon.
Hole and heap
These are usually nodes. It is possible that a large hole or heap have a size beyond 5 meters and could be tagged on a way; avoid tagging it as an area because it would make it nearly impossible to use for navigational applications. (A 10 meter hole or heap technically make the road disappear and people usually expected to go around it, creating a new path without hole or heap.)