While I do not yet really get the purpose, technically it may be easier - and already achieveable - to implement if we have fixed signs that are permanent. Instead of buying and setting up a new sign, one buys "a place on the sign", like a notice on a typical overcrowded blackboard. Someone would have to write a rather complex ARCC/WebIg script to work with that, and I don't know about persistence of variable data on those signs. ...Just some brainstorming on the technicalities...
