According to your quote, you can ride in bike LANES, (areas on regular roads that have been set aside for bikes), or bike ROUTES, (just regular roads with signs that say "bike route"). But NOT bike PATHS (trails built only for bikes and pedestrians)
Furthermore, the road you were riding on, according to you, had signs that said "No motorized vehicles", which you ignored.
The cops may have been "pissy", but they were also right, and you were wrong. The bike paths were put there for your convenience, but only while you're walking or riding a bicycle.
Even if it WERE legal for you to do this, it's still extremely rude and dangerous. Think about it. You were complaining that the roads were unsafe for you to drive on because of traffic that was moving too fast (40 mph for you)
So your solution is to get on a bike path and go barreling down it a 25 - 30 mph, when most bikers ride at about 10 - 15 mph.
SO your solution to other people endangering you by driving too quickly, was to endanger others by doing the same. The old "shit rolls downhill"
Just knock it off, you give the rest of us a bad name with your sense of entitlement and reckless habits.