|A highway (on which non-railway traffic is also allowed) has railway tracks embedded in it, but the rails are mapped as separate ways.|
|Used on these elements|
|Status: in use|
|Tools for this tag|
A highway (on which non-railway traffic is also allowed) has railway tracks embedded in it, but the rails are mapped as separate ways.
The key embedded_rails=* is used to notify other traffic that a highway (or a section of it) actually has some type of railway tracks embedded in it, although these rails are mapped as separate ways.
Three conditions on the use of the tag follow as corollary from the key definition above.
- That the railway=* track actually runs embedded in the highway=*.
- That the highway is available and generally legally accessible also for other traffic aside from the (possible) railway-specific traffic.
- If the tracks run on a separate, generally non-accessible, lane between highways or next to a highway, the adjacent highways should not be tagged.
- That there is a railway=* track already separately mapped that this tag shadows (possibly, though not necessarily, sharing nodes with the highway).
So, for example:
|Example of tram track embedded on a highway. The highway is accessible to other traffic and furthermore flanked by sidewalks, forcing also bicycles to use the highway with the embedded tram tracks.||Example of tram tracks that run on a separate, generally not legally accessible lane between highways. Do not apply the tag to the highway(s) next to the tracks.|
Motivation and Rationale
The railway=tram wiki page suggests mapping tramway tracks always alongside highways as a separate way (though possibly using the same nodes as the highway) even if they in fact run on the highway. There are also cases where subway rails (railway=subway) or a railway railway=rail run embedded on a highway and are similarly tagged as separate ways.
There are many good reasons for this convention. Nevertheless other traffic should be notified that there is a track, physically, running on the highway. The need for such notification is particularly acute for bicycles, mopeds and other vehicles that have narrow tyres. Railway tracks have deep indentations that narrow wheels can easily and dangerously slip into. This danger alone warrants a note to routing programs so that they can avoid routing e.g. bicycles through such streets.
Also especially the existence of railway=rail tracks on a highway may imply that the highway can occasionally and sporadically be inaccessible for other legal traffic when there are trains using the tracks.
Because the tracks are mapped as separate ways, this tag is needed for the highway.
The value of the key should always follow the value of the railway tag that it 'shadows'.
If only a subset of lanes on a multi-lane highway have embedded tracks, this can be handled as usual with the lanes-tagging scheme. So, for example, if only the second lane in a two lane highway has an embedded tram track, this would be tagged (as far as the embedded_rails=* tag goes) with:
highway=* lanes=2 embedded_rails:lanes=|tram ...
The values for the key are as follows:
|embedded_rails||abandoned||Abandoned railway on highway. You should tag also railways that may not be in use, since the physical tracks nevertheless are permanent feature of the highway and pose a permanent threat to some vehicles.|
|embedded_rails||construction||Railway tracks being constructed on highway. You should tag also railways that may not be in use, since the physical tracks nevertheless are permanent feature of the highway and pose a permanent threat to some vehicles.|
|embedded_rails||disused||Disused railway tracks on highway. You should tag also railways that may not be in use, since the physical tracks nevertheless are permanent feature of the highway and pose a permanent threat to some vehicles.|
|embedded_rails||funicular||Funicular tracks railway on highway|
|embedded_rails||light_rail||Light rail tracks on highway|
|embedded_rails||miniature||Miniature railway on highway|
|embedded_rails||narrow_gauge||Narrow-gauge railway on highway|
|embedded_rails||rail||Railway tracks on highway|
|embedded_rails||subway||Subway tracks on highway|
|embedded_rails||tram||Tram tracks on highway|