Only advertisers love QR codes, but Mercedes-Benz actually made them useful in the real world. By putting the codes on the B-pillars and gas doors of its vehicles, firefighters can use its Rescue Assist app and quickly figure out how to help folks involved in an accident. The automaker made the latest version easier to use by adding augmented reality (AR) and 3D visualization features. That lets first responders see dangerous components -- like fuel lines and high-voltage components in electric and hybrid cars -- overlaid on the real-world vehicle, Pokémon-style.