NL:Key:oneway

Example of no entry sign, as included in Vienna Convention on Road Signs and Signals (C, 1a; "entry is prohibited for all vehicles"). Typically used on oneway roads from inaccessible side.

De oneway tag wordt gebruikt op wegen en andere lineaire OSM-elementen om aan te geven dat voertuigen alleen in één richting mogen gaan. Let erop dat een verkeersbord dat toegang vanaf één kant van de weg of op één punt op de weg niet automatisch betekent dat de weg voor éénrichtingsverkeer bedoeld is (let ook op andere verkeersborden of wegmarkeringen op of langs de weg).

Zie ook de NL:Key:access-pagina voor een uitgebreidere beschrijving van toegangsrestricties.

In kaart brengen

Normaal gebruik

Om een weg (of ander lineair object) als éénrichtingsverkeer te markeren, voeg simpelweg de volgende tags toe:

• highway=*
  • oneway=yes

Houd er rekening mee dat de oneway tag gerelateerd is aan de richting van een lineair OSM-element ("way"). Identifying the direction of a way beschrijft hoe je de richting van een way kunt bepalen in de belangrijkste OpenStreetMap editors.

Als de oneway restrictie in de omgekeerde richting van de getekende weg geldt is het in de meeste gevallen het beste om de weg om te keren ("reverse way" in de editors) en dan oneway=yes toe te voegen. In de zeldzame gevallen waarin dit niet mogelijk is, kun je in plaats daarvan oneway=-1 toevoegen.

Als de weg alleen éénrichtingsverkeer heeft in bepaalde delen, moet je de weg opdelen in stukken en de oneway tag toevoegen aan de relevante wegdelen.

Geïmpliceerde oneway restricties

Some tags or tag combinations (such as junction=roundabout, highway=motorway and maybe others) imply oneway=yes by definition (separate carriageways for the two directions of traffic are part of the defining characteristics for motorways in the Vienna Convention on Road Traffic) en daarom is deze tag hier optioneel. If a tag implies a oneway value this may be noted on the implying tags wiki pages, but read implied on such pages with caution, since not all mentioned implied values are implied by definition. Besides the mentioned tags there is no general agreement which tags imply oneway=yes, different applications may handle this differently, so it is generally recommendable to be explicit whether there is a oneway restriction.

oneway = no

oneway=no wordt gebruikt om duidelijk aan te geven dat een (deel van een) straat geen éénrichtingsweg is. Gebruik deze tag alleen om te voorkomen dat fouten ontstaan, zoals op plekken waar veel éénrichtingsverkeer is of om standaardwaarden te overschrijven.

False oneway streets (Faux oneway)

False oneway streets (German: Unechte Einbahnstraßen) are a concept in some countries which refers to two-way streets which have a no entry sign at one end. These can be identified by their lack of oneway sign.

There are two alternatives of how to map this:

• Split a small section (about 1 metre) at the entrance to the street and tag it with oneway=yes. (Prefered by some, but perhaps less accurate since it is not a true oneway street).
• Using a restriction relation where the no entry sign is. The tag of the relation is then e.g. restriction=no_entry, and exeptions can be mapped using except=* (e.g. for bicycles, busses, etc.)

Verwante tags en uitzonderingen

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, oneway:bicycle=no for bicycles. Use cycleway:left=* / cycleway:right=* / cycleway:both=* to detail bicycle infrastructure or use the older cycleway=opposite/opposite_lane/opposite_track, see Bicycle for examples. See Key:access for other possible sub-values.

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 along with applicable oneway conditional restrictions. If the direction changes often, oneway=alternating might be more appropriate.

Op waterwegen

Example of mandatory oneway traffic on a waterway (which itself has no direction of waterflow)

Legal oneway restrictions for a mandatory direction of travel for boats on waterways can be mapped with oneway= as well, for instance when signposted with a seamark or when this is part of legislation. The direction of flow of water is normally defined by the direction of the osm way. For special cases in areas with bi-directional water flow please consider different tags from oneway=, since oneway= describes the legal direction of travel, not the physical direction of flow.

flow_direction=both wordt in zeldzame gevallen gebruikt op waterwegen en pijpleidingen om aan te geven dat de stroomrichting in beide richtingen plaats kan vinden.

Data consumers

List of values

• oneway=yes (discouraged alternatives: "true", "1")
• oneway=no (discouraged alternatives: "false", "0")
• oneway=-1 (discouraged alternative: "reverse")
• oneway=reversible - Roads that alternate between different directions regularly but infrequently. This tag could be used with additional conditional restrictions as explained on its page
• 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:

• oneway=yes to vehicle:backward=no
• oneway=-1 to vehicle:forward=no

Voetgangers

Orla Perć, oneway hiking route - tagged as highway=path + oneway=yes + foot=yes + bicycle=no + ski=no + snowmobile=no

This assumes that oneway restrictions do not apply to pedestrians. This in in line with the meaning of common one-way traffic signs, such as sign C, 1a in the Vienna Convention on Road Signs and Signals ("entry is prohibited for all vehicles").

Note that even on a formal highway=footway (with a "footway" traffic sign that in general means that vehicles may not enter, such as D, 5) some vehicles may still enter; for instance when certain types of vehicles (such as bicycles) or certain groups of road users (such as destination traffic) have been exempt from this prohibition by an additional panel. Even in such cases oneway=* may not apply to pedestrians but only to vehicles.

Although unusual, oneway on pedestrian highways (path, footway, track) is possible in some countries. While it is sometimes represented with the disputed tag: oneway:foot=* it has been argued that the tag foot:backward=no should be preferred, as it doesn't suffer from the problems of the former. In the past highway=path + oneway=yes was used by some mappers to mark that pedestrians may move only in one direction, these situations should be corrected, as oneway in OSM only applies to vehicles. Furthermore a highway=path may be open to others road users such as cyclists.

Not all current usage reflects the above theory. For example, in late 2021 highway=path + oneway=* used on 32000 (out of total 72000) objects, oneway:foot=yes on 550 (out of 2200 total oneway:foot=* objects, mainly used as "oneway=yes + oneway:foot=no") and foot:backward=no on 110 (out of total 260), showing that some mappers consider oneway=* valid for all kinds of movement, including foot. On the other hand, there is a massive number of one-way streets tagged only with oneway=yes which are bidirectional for pedestrians. Data consumers could follow the vehicle-only theory in most cases but pay special attention and possibly deviate from that theory if oneway:foot=* is present or if oneway=* is set on a footway. Of course, data consumers may always decide to interpret tags however they deem suitable.

Mandatory oneway direction for pedestrians as a social distancing measure. A prohibitory sign was placed at one end, while at the other end of the path no prohibitory sign was placed.

Cases of oneway pedestrian traffic includes some hiking trails - some permanently, some during the high season crowding, border crossing, exit-only passages and more. Mandatory oneway traffic for pedestrians also has been used as a measure for social distancing against COVID-19.

Country-specific implications

The following table lists country-specific information needed for correct interpretation of oneway tags.

Country	Country-specific implications of oneway tags
Nederland	Oneway restrictions apply not just to vehicles, but to "voertuigen, ruiters en geleiders van rij- of trekdieren of vee". In OSM context, this e.g. means oneway=yes implies not just vehicle:backward=no but also horse:backward=no (unless oneway:horse=no).
Verenigd Koninkrijk	Oneway restrictions also apply to horse riders. In OSM context, this e.g. means oneway=yes implies not just vehicle:backward=no but also horse:backward=no (unless oneway:horse=no).

Mogelijke fouten

Do not use access-tags to specify exceptions to oneway-tags. Exceptions to oneway-tags must also be specified with oneway-tags. For example:

• Wrong: oneway=yes + bicycle:backward=yes
• Correct: oneway=yes + oneway:bicycle=no

Uitgefaseerde tags

• oneway=1 has been deprecated in favour of oneway=yes.
• oneway=0 has been deprecated in favour of oneway=no.

Zie ook

• 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
• foot:backward=no consistent oneway restriction for pedestrians
• oneway:foot=* - disputed oneway restriction that apply to pedestrians