Manipulated text in physical spaces can hijack autonomous systems, while existing cybersecurity tools offer no protection against this risk.

source https://www.techradar.com/pro/not-even-road-markers-are-safe-from-hackers-experts-find-that-self-driving-cars-and-autonomous-drones-can-be-hacked-by-reading-malicious-instructions-written-on-road-signs