(1) It is not 100% sure that communication takes place between the sign and the vehicle, (2) nor any way to stop signs sending their messages once they have been received. (3) Nor is there any way to change the messages they send unless they are variable message signs (VMS) as found on some motorways. Day and night, year after year, whether there is anyone to see them or not, road signs are out there endlessly transmitting the same messages.
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