Ingolstadt (city of Audi HQ) had (still has?) this experiment. Cars were getting signal from traffic ligjts and you as a driver got a warning sign like: "drive

Ingolstadt (city of Audi HQ) had (still has?) this experiment. Cars were getting signal from traffic ligjts and you as a driver got a warning sign like: "drive 30 km/h" to hit green light without stopping.