From today, 7 July 2026, anyone who buys a new car in the European Union will find something new on board: in the event of very sudden braking, the rear brake lights no longer remain fixed, but begin to flash rapidly. The system is called “Emergency Stop Signal” (ESS) and was already present on some high-end models, but from today it becomes a mandatory requirement for all cars newly registered in the EU, including those derived from previous approvals.
The idea behind it is simple: an intermittent signal captures attention faster than a fixed light and those tenths of a second gained by the person driving the car behind can translate into meters of extra braking distance. The goal is reduce the number of rear-end collisionsamong the most frequent accidents in fast traffic or in motorway queues.
The novelty, however, does not come alone: it comes into force together with a broader package of safety systems provided by the EU Regulation 2019/2144the text that has been redesigning the mandatory standards for European cars for years.
How the ESS system works in your car
The operation of the ESS is entirely managed byon-board electronicswithout any intervention from the driver. When the driver presses the brake pedal with sudden force, the control unit processes in real time the data arriving from multiple sensors: the instantaneous speed of the vehicle, the pressure on the pedal, the behavior of the ABS and the deceleration rate.
The system activates only in conditions of real emergency: the main threshold is deceleration, which must exceed 6 m/s² (a much more intense braking than normal braking, which is around 2.5 m/s²); alternatively, the signal may be triggered when the ABS comes into full action at speeds above 50 km/h. It therefore does not intervene in normal braking or in those typical of urban driving.
When the thresholds are exceeded, the rear brake lights begin to flash rapidly: on some models, especially high-end ones, the flashing can also involve the four arrows, to make the signal visible even to those who are further away or to the side. The signal switches off automatically as soon as heavy braking or ABS activation ends.
Mandatory stop lights: one piece of a broader safety package
The flashing stop sign is not the only new feature that comes into play today. EU Regulation 2019/2144, also known as “General Safety Regulation”, proceeds in phases from 2022, and the one starting today concerns in particular newly registered cars and light commercial vehicles (categories M1 and N1).
Together with the ESS, the system is strengthened control of driver distractionwhich stops relying only on indirect signals such as steering wheel movements and also uses a camera facing the driver. The automatic emergency braking also changes, which now has to recognize not only other vehicles but also pedestrians and cyclists. For heavy vehicles, trucks and buses, specific requirements are added such as blind spot control. An important aspect should be clarified: the rule only concerns cars registered from today onwards.
Those who already have a car do not have to install anything and there are no retroactive update obligations, so the change in the fleet of vehicles in circulation will be gradual, as older cars are replaced.
