I’m not aware of a single bike route in my area, except US Bike Route 1, and US Bike Route 76 which happen to intersect not far from home. But guess what? Even though these are designated bike routes, there isn’t a marked lane or extra pavement. Just some signage. Does that mean I can’t ride?
Problem with most “bike routes” is that they are stuffed with walkers and families and have a 15 mph limit. Not really practical for actual bike riders.
My wife keeps wanting to go for a walk on the maple valley trail and I inform her that it is paved. It is for bikes and rollerblades. I like to walk on DIRT. There are very nice trails in the woods in our area that are not right next to a freaking hiway.