The stickers could even mess with the speed-limit recognition systems already available on some production cars. University of Washington researchers say the trick isn’t foolproof, though.

Researchers at University of Washington, University of Michigan, Stony Brook University, and UC Berkeley have figured out how to hack self-driving cars by putting stickers on street signs.

A team of researchers says stickers on street signs could be enough to confuse self-driving cars. Amid the rush to develop self-driving cars, there are a few questions that need answering.

If attackers know how a car classifies the objects it sees (such as target photos of signs), they can generate stickers that can trick the car into believing a sign really means something else.

Street art — namely, spray-painted graffiti on building walls, train cars and traffic signs — has been a popular, often rebellious, DIY tradition in urban centers since the 1960s.