From OpenStreetMap Wiki
|highway = via_ferrata|
|A mountain route equipped with fixed cables, stemples, ladders, and bridges.|
|Used on these elements|
|Tools for this tag|
|This tag page is a stub. You can help OpenStreetMap by expanding it.
Similar pages for structural reference: Tag:railway=tram, Tag:waterway=dock.
Use highway=via_ferrata to represent a ('steel path') for traversing a mountainside. Usually very exposed and climbing gear required.
See Proposed features/via ferrata for details of mapping.