After the third brake light at the rear, vehicles could soon be equipped with a fourth light, this time positioned at the front. A surprising idea at first glance, but one that aims to improve the readability of the driver's intentions for all road users. Unlike traditional red lights that come on when a car brakes, this new device would take the form of a green light integrated into the grille. It would only come on when the vehicle is completely stopped, allowing pedestrians, cyclists, and motorists to clearly identify whether the car is stationary or about to move off. The objective is simple: to avoid misunderstandings when approaching a pedestrian crossing or intersection, and to limit the risk of accidents.
A promising innovation, but still under study
The idea was developed by a team of Slovak engineers who contacted the European Commission. Before considering widespread implementation, Brussels requested scientific data on the impact of this traffic light on road safety. A first study, published this June 2025 in the journal Vehicles, reveals that this front light signal could prevent between 7 and 17% of accidents occurring at intersections. By reducing driver reaction time, this system could limit the speed of impacts, and therefore the severity of injuries. The researchers nevertheless specify that the usefulness of this light will depend on its visibility. In certain situations, particularly on streets with priority to the right, the front of a vehicle can be difficult to see. Hence the idea, in the long term, to also provide side lights to further improve safety. It remains to be seen whether the European Union will make this light signal a standard. For the moment, nothing has been decided. But a simple green light could soon play a crucial role in road safety.
