Road rage is real. And it puts everyone at risk. Researchers from École Polytechnique Fédérale de Lausanne—or EPFL for short—are working on an in-car facial recognition system to tell when a driver isn't happy. Could this work to prevent road-rage?

The researchers are working with engineers from PSA Peugeot Citroen, and they adapted an infrared camera-based facial detection system to keep an eye out on anger and disgust.

Still, it's tough to nail down just what sort of facial expressions really mean for some people. It is hard to tell if a driver is angry and not everyone uses the same facial expressions to indicate anger or disgust.

But in the majority of test situations the facial-detection system was able to accurately spot an enraged driver, and eventually it could be used to limit a vehicle's speed, or flash and sound a warning that they need to calm down.