Just noticed you are from Texas... the only place I have seen the Share the Road signs posted on the interstate freeways and addressing sharing the road between motorists and motorcycles. (there may be other states that do this, but I AM familiar with Texas due to family there).
The reason I responded to you in particular was this line: "The bureaucrats have an idyllic fantasy that cycling is pedaling at speeds just above walking pace and limited to short distances;" which was in response to the line in the post you responded to: "any reasonably fit cyclist on a decent bike should be able to maintain 20 mph." And then lastly this comment: "they foster inequality between cyclists and motorists."
So it was all a response to a thread of argument that I saw to which I decided to lay out my thoughts.
A true vulnerable user law would be a nice thing... and frankly I had no idea that motorcyclists were campaigning for such a thing.
I have to agree with you wholeheartedly regarding bike lanes... they are nothing more than a poor bandaid to a system that needs some real revamping. That said, I'd rather see a bike lane than nothing more than a "share the road" sign. I'd much rather see a road network that takes all vehicles and persons into mind. But having toured through Texas, I can tell you that there are vast stretches of road there that will never see any more improvement... and knowing the Texas attitude of "Don't Mess with Texas" (which means more than don't litter) I know that most Texans frankly don't give a cr@p about anybody not driving a pickumup truck.
See if this road seems familiar as a common sight:
Click to enlarge, obviously. That is a typical Texas farm road... yup there is a painted shoulder line, and to the right of that line is one mean rough surface... and these roads line the state. How'd ya like to be taking the lane just beyond that crest as someone comes upon you at 65 or 70MPH?