Key mtb:scale useful for pedestrian routing?

[supsup]

Yes, such a clear mapping as I originally suggested does not hold. However: (copied from the original thread):

@supsup

After reading the definitions back and forth, it seems to me that a resonable assumption is

S4 and higher is probably at least T3.
S3 is probably T2 (but probably not higher).
S2 and lower is no higher than T2, quite possibly T1 (so no assumption should be taken, only possibly in reverse case should some router decide not to route over paths without sac_scale for fear ofthem being too difficult).

It should always be recommended to add both mtb:scale and sac_scale and point out that these assumptions are mostly correct, but not alway.