You can vaguely see the 3M's bar codes installed in these two traffic signs. Photo: Business Insider/Danielle Muoio

The company that invented Post-It notes is hiding invisible messages in signs to help self-driving cars see the world

General Motors and Ford are working with 3M to use infrastructure to get autonomous cars on the road faster

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You can vaguely see the 3M's bar codes installed in these two traffic signs. Photo: Business Insider/Danielle Muoio
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