In the UK in the late 70’s they rolled out a scheme where they fitted disabled drivers cars with little flags they could raise if they were in trouble. There were TV campaigns to make people aware - “if you see this flag, the driver needs help”.

Campaign was swiftly abandoned, because enough people saw the flag to mean “I cant defend myself and will be easy to steal from!” that it did more harm than good.

Hey guys! We’ve invented the Dead Person Simulator from that Black Mirror episode “Don’t Invent Dead Person Simulators!”