wiki says that is to be used for roads with markings but I doubt there, 
the tag was probably added to indicate it was part of a cycle route, you can see the brown lines (usually arrow signs on lamp posts etc added 10-20 years ago)
https://fifeonline-maps.maps.arcgis.com/apps/webappviewer/index.html?id=f6186ea47efc46cd911a4d5314823900