Trail difficulty
This extra provides information about a trails difficulty for hiking as well as for mountain-biking.
| Value | foot-* | cycling-* |
|---|---|---|
| 0 | no tag | no tag |
| 1 | sac_scale=hiking | mtb:scale=0 |
| 2 | sac_scale=mountain_hiking | mtb:scale=1 |
| 3 | sac_scale=demanding_mountain_hiking | mtb:scale=2 |
| 4 | sac_scale=alpine_hiking | mtb:scale=3 |
| 5 | sac_scale=demanding_alpine_hiking | mtb:scale=4 |
| 6 | sac_scale=difficult_alpine_hiking | mtb:scale=5 |
| 7 | — | mtb:scale=6 |