@mmckenna nailed it. I can think of a lot of places where it would be appropriate to wear a yellow vest. Working on the side of the road would be one. Even doing parking or something like that as a ham, or working along a parade route. That doesn't say, "I demand attention." That says, "I don't want to get run over!"
There are so many pics out there of people sitting inside operating radios wearing the vests, or examples of walking into stores or Dennys or whatever with radios blaring. Not once in my life have I ever found a reason to have my ham radio turned on (at any volume level) while I have breakfast at Denny's. Just not a thing.
mmckenna said:
Seems like they struggled to find their place after cell phones came along and CB dropped off. I know some are active on GMRS (675/141.3), and that was a good plan, but at the time GMRS was too much of a niche radio service. Maybe starting that up again now that GMRS is gaining some popularity.
Some people out where I live started something similar, not affiliated with REACT or anything. We have people get stuck out here in the sand regularly (even worse in the mud after a rain), delivery drivers, semi trucks, even the mail carriers. Some of the sand is so deep just on the shoulders of the road that you get stuck just pulling off the road. With dirt shoulders AAA will usually not help, because they consider it to be offroad. So some neighbors pitched in, put up some signs. I believe they list GMRS Channel 1, and then a phone number for one of the old guys who basically monitors 24/7. Phone service is spotty too. People show up in their pickup trucks or tractors and pull you out. No yellow lights. No vests. No radios cranked up at Denny's. Just a bunch of neighbors helping each other, and other travelers.