|Oneway streets are streets where you are only allowed to drive in one direction.|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
The oneway tag is used to indicate the access restriction on highways and other linear features as appropriate. This means that this tag should be used when this way can only be used in one direction. Note that a no entry sign prohibiting entry from one side or across one point of the road, does not automatically imply that the entire road is oneway (look for oneway signs along the road).
Take a look on the access=* page to add more detailed restrictions.
How to Map
To mark a highway (or other linear feature) as oneway, simply add a oneway tag:
Note that the oneway tag is defined in relation to the direction the linear feature ("way") is drawn in OpenStreetMap. Identifying the direction of a way describes how to determine the direction of a way in the main OpenStreetMap editors.
If the oneway restriction is in the opposite direction to the drawn way, the fix in most cases is to turn the way around ("reverse way" tool in the map editors) and apply oneway=yes. If in a (very) rare case, the direction of the way cannot be changed, you can instead tag it as oneway=-1.
If the road is only a oneway road in certain parts, you'll have to split up the way in several parts.
Implied oneway restriction
Some tags (such as junction=roundabout, highway=motorway and others) imply oneway=yes and therefore the oneway tag is optional. If a tag implies a oneway value this is noted on the implying tag's wiki page.
oneway = no
oneway=no is used to confirm that (a part of) a street is NOT a oneway street. (Use only in order to avoid mapping errors in areas where e.g. oneway streets are common, or to override defaults.)
Sub keys / exceptions
Oneway can be used in conjunction with vehicle type in order to tag exceptions. I.e. oneway:moped=no for a one-way streets where mopeds are allowed to drive in the opposite direction. Bicycles (oneway:bicycle=no) are handled specially and cycleway=opposite/opposite_lane/opposite_track needs to be added for compatibility: (See Key:access for sub-values or Bicycle for examples).
Time conditional restrictions
If a road is one-way at certain times of day, and one-way in the other direction at other times then it can be tagged with oneway=reversible. To precisely define the times, or to map more complex oneway restrictions, you can use Conditional restrictions. If the direction changes often, oneway=alternating might be more appropriate.
List of values
- oneway=yes (discouraged alternative: "true", "1")
- oneway=no (discouraged alternative: "false", "0")
- oneway=-1 (discouraged alternative: "reverse")
- oneway=reversible - Roads that alternate between different directions regularly but infrequently
- oneway=alternating - Roads that alternate between different directions regularly and often
The semantics of any other value is undefined and the use of other values is discouraged.
Note: The value -1 is only needed when the direction of oneway travel is in the opposite direction of that used when the way was drawn. One can avoid this situation by reversing the direction of the drawn way before applying the oneway tag.
Interpretation for routing
The oneway tag can be interpreted (for routing purposes) to the generic system as follows:
This assumes that oneway restrictions presumably do not apply to pedestrians. Although unusual, oneway on pedestrian highways (path, footway, track) is possible in some countries, for hiking trails for instance (during the high season crowding or for security reasons).
- access=* - General access restriction key.
- Set of tags that imply oneway=yes according to iD editor
- Pull request to consider implied onewayness in Default Map Style