Since the beginning of this year Switzerland so called "Velostrassen" are a thing, these are simply streets in 30km/h zones with priority for bicycles instead of the right before left regime in such zones.
This is at least similar to the situation in Belgium (legally) and some other countries (informally) where similar concepts exist, in BE, NL and so on such streets are tagged with cyclestreet=yes.
This is however different to the German concept of "Fahrradstrassen" which are wider bicycle paths on which pedestrian use is allowed and you have to ride on the right (with other words essentially a normal "Veloweg" in Switzerland). "Fahrradstrassen" are tagged with bicycle_road=yes and IMHO that should always be on a highway=cycleway.
I would suggest that in Switzerland we should use cyclestreet=yes as this models the legal situation here better than the German bicycle_road=yes and would document that in the wiki in the appropriate places if there is no big protest.
Further I've noticed that there is small number of uses of bicycle_road in Switzerland (http://overpass-turbo.osm.ch/?q=LyoKVGhpcyBoYcSGYmVlbiBnxI1lcmF0ZWQgYnkgdGhl...) that I suspect are either actually a Velostrasse or are mistagged due to an issue with the JOSM preset for bicycle road that might have been used outside of DE. These should naturally be checked and changed to cyclestreet=yes if we have a consensus on the matter.
Simon