Tag:oneway=alternating
 oneway = alternating
|
 |
| Description |
|---|
Oneway that changes its direction often 
|
| Group: restrictions |
| Used on these elements |
    |
| Requires |
|
| Useful combination |
| See also |
| Status: de facto |
| Tools for this tag |
This tag is used for roads that alternate between different directions regularly and often. Its main usage is on narrow bridges or at road construction sites. Often there are traffic lights at both ends regulating traffic flow. It may also occur on the final road segment connecting to a route=ferry, where that road segment is controlled by the ferry operator and alternates between boarding and alighting the ferry.
This tag is only used for roads that change direction often (usually several times per hour) and regularly. Use oneway=reversible and Conditional restrictions as needed for roads that only change direction at specified times. If you are not sure whether to use oneway=reversible or oneway=alternating, ask yourself: When I need to use this road but traffic is traveling in the opposite direction, would I wait for the direction to change to enter the road (oneway=alternating) or would I use a different route (oneway=reversible)?
Routing engines are encouraged to route over this type of oneway independent of direction but use a heavy penalty when calculating the travel time to allow for possible waiting times.
Tags to use in combination
lanes=*- Total number of traffic lanes available for motorised traffic
See also
If there is no traffic control mechanism for alternating the direction of travel, then use oneway=no instead of alternating. With oneway=no, the road segment is simultaneously open in both directions, and road users have to figure out themselves how to take turns in narrow places, whereas with oneway=alternating, the infrastructure itself is alternating the direction.
If there are priority signs, then priority=forward or backward indicates which direction has priority if there is no traffic control mechanism or in case the traffic control is disabled.