Key:hiking_exposition

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hiking_exposition
Description
The fall exposure rating takes into account the consequences of a fall, excluding flat falls, under summer conditions (snow-free trails and slopes below 2,500 m)
Group: properties
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Implies
Useful combination
Status: unsupported “Alpha” status

[[Category:Key descriptions with status "unsupported “alpha” status"|hiking_exposition]]

Fall Exposure Rating The fall exposure rating takes into account the consequences of a fall, excluding flat falls, under summer conditions (snow-free trails and slopes below 2,500 m). On a good trail, this refers to the consequences of falling off the side of the trail.

E1
A fall is always possible. A fall on the slope is easy to arrest. The risk and severity of injury will mainly depend on the nature of the terrain (grass, scree, etc.).
E2
In places, the slope and the nature of the terrain do not allow for an easy arrest in the event of a fall, leading to a slide of a few dozen meters at most, without major obstacles. The risk of injury is increased by the nature of the terrain, the slope, and small obstacles.
E3
In the event of a fall, a slide that is not stopped immediately ends in a violent impact against rocks or trees, or in a fall over cliff bands, leading to serious or even fatal injuries.
Examples
E4
In the event of a fall, a slide that is not stopped immediately ends in a fall over high cliff bands, leading to almost certain death. Falling is not an option.

origin

This scale is a direct, lazy translation and shamelessly stolen from Camp2camp : https://www.camptocamp.org/articles/106859/fr/aide-topoguide-cotations-de-randonnee-pedestre-et-trail

other similar tags

This might look like sac_scale, and yes it overlaps on it's exposition part, but I do believe, both properties are orthogonal. You can have a technically easy path to hike, with high cliff on a side causing a high fall exposition.

Another way to say it is that sac_scale isn't a good way to depict both fall exposition and hiking difficulty. So adding a new tag, dedicated to fall exposition makes sense IMHO