Engineers at Duke University have demonstrated a system — MadRadar — for fooling automotive radar sensors into believing almost anything is possible. Watch this video to see how the technology can hide the approach of an existing car, create a phantom car where none exists, or even trick the radar into thinking a real car has quickly deviated from its actual course.

“Without knowing much about the targeted car’s radar system, we can make a fake vehicle appear out of nowhere or make an actual vehicle disappear in real-world experiments,” said Miroslav Pajic , the Dickinson Family Associate Professor of Electrical and Computer Engineering. “We’re not building these systems to hurt anyone, we’re demonstrating the existing problems with current radar systems to show that we need to fundamentally change how we design them.”