gpserror
Not necessarily...I think that most roads, excepting specifically interstate highways, are legal for bicycle travel (and walking travel for that matter) but people forget that they are allowed.  That being said obstructing traffic due to slow speed is not legal.  Share the road!

I don't see specific painting on the side of the road and that usually is the key for a road to be marked cycleway=* ... so probably shouldn't touch this here.