Hi!

Only ways that have one of the cycleway traffic signs should be marked as cycleways.

Check out the possible variants at 
https://wiki.openstreetmap.org/wiki/Lv:Latvian_tagging_guidelines#Veloce%C4%BCi_un_veloinfrastrukt%C5%ABra

OSM generally tags based on allowed (i.e. legal) access rather than how it's used in practice.