[Tagging] Can highway=cycleway be limited to MTB?

[Marc M.]

On Sat, 4 Apr 2020 at 00:01, Joseph Eisenberg wrote:
> highway=cycleway + mtb=designated has been used 558
> times: http://overpass-turbo.eu/s/Sjl

your query target highway=cycleway + mtb=yes
Does exit a sign "cycleway not alloed with a mtb" ?
if not, this tag add no additional value or is an error.

highway=cycleway + mtb=designated is used only 25 times
https://overpass-turbo.eu/s/SjA