Is it??? I had no idea and I spent a month riding all day every day there. No-one batted an eyelid. The only non-obvious road law I was aware of was priorité à droite and it came up maybe twice.It is compulsory to ride on the cyclepath in France if there is one.
Then again you are legally obliged to wear a helmet in Spain unless you're cycling uphill or in hot weather. (What constitutes hot weather or how you get the helmet to the top of the hill is never mentioned). Again, no-one batted an eyelid at my unhelmeted noggin en España.
Cycling laws are idiotic at best, moreso when inconsistently applied.