The buses in Dayton use the larger ones, and they usually have some number of dead/inactive dots.
The flip displays for the Dayton bus system are on the outside of the buses, and the only thing holding them in place are a couple of Phillips screws. I wonder why the scrappers have not stolen them yet, given that Dayton is the land of 24-hour nonstop crime. Scrappers here literally strip the telephone wire out of the steam tunnels, conduit from the outsides of buildings, manhole covers from nearly every unguarded location, and even the bronze urns and plates from the headstones in the cemeteries. I even know someone who had their storm windows stolen for the aluminum content. Apparently flip dot displays are too esoteric for the average meth-addled criminal element.
Figuring the number of metro transit systems that were equipped with these that are now getting EOL'd you'd think there'd be more; ALas, I think most are getting landfilled. This will be one lusted-after technology in only a few years, IMHO.