Validator: Detect invalid barrier nodes

[anonymous]

Barrier tags must not be used on junction nodes connecting multiple ways. ​https://wiki.openstreetmap.org/wiki/Key:barrier#How_to_map_barrier_nodes

Such invalid barriers could be detected by the validator:

• a node has a barrier tag
• the node belongs to more than one way with a highway tag

[Famlam]

Note that this can be fine with some barriers, e.g. bollards. And I assume you mean either three connecting ways or two connecting ways where at least one way isn't an end node.

Osmose has such a check, see ​sql41. Might be useful to see that implementation in case someone wishes to implement this.

[skyper]

There is already a warning see combinations.mapcss line 122-147​ though it makes some assumptions and excludes some highway=*, see #20742.
Please, provide real world examples where you expect to get a warning but current implementation does not catch it.