Proposal:Junction details
| Additional junction details | |
|---|---|
| Proposal status: | Abandoned (inactive) |
| Proposed by: | Johan_C |
| Tagging: | junction:ref=[[Tag:junction:ref=<ref>|<ref>]] |
| Applies to: | 
|
| Definition: | Specify the ref of the junction a way belongs to |
| Statistics: |
|
| Draft started: | 2012-11-24 |
This proposal introduces the key junction:ref which allows to specify the reference of the junction a way belongs to.
Note: As of Nov 24th 2012 this key is already used about 6000 times according to taginfo.
Rationale
Nowadays the big suppliers of navigational devices offers a roadsign view. The key destination=* and Proposed features/Destination details offer support for a roadsign view. The key junction:ref is necessary to support the roadsign view of both exit numbers as can be seen on these signs.
Tagging
| Tag | Description | Example |
|---|---|---|
| junction:ref=* | Reference number. | 16 |
Examples
| Tags | Description |
|---|---|
| junction:ref=2 | Exit 2. This key should be used on the left way directly behind the motorway_junction node. |
| junction:ref=3 | Exit 3. This key should be used on the right way directly behind the motorway_junction node. |
Common questions
Why not stick to the ref=* in motorway_junction=*?
Good question. For normal motorway_exits the ref in the motorway_junction would be sufficient. However, there are some other reasons which make it more logical to use junction:ref.
1. Consistency in tagging. All other information to support a Roadsign view is stored in OSM ways, like maxspeed=*, lanes=*, destination=*, destination:ref=*. So why shouldn't the junction:ref info be stored in the way?
2. The current tagging of the motorway_junction node does not support the situation as shown above
Why not deprecate motorway_junction?
It's used too many times already. And it looks good in a renderer like Mapnik.
Why name it junction:ref?
It's consistent with other tagging, like destination:lanes=* and destination:ref=*
Why not use ref=*?
The ref of the motorway_link is quite often the same as the ref of the motorway, like "A 3".
Comments
Please use the Discussion page for this.