EU mandates breathalyzer-ready cars from July 1

EU breathalyzer-ready – From July 1, every vehicle sold in the European Union must include a standard, preinstalled electrical interface and reserved space so an on-board breathalyzer “alcolock” can be fitted and connected to the ignition system. The rule is designed to cut alcohol-r

By July 1, the European Union is changing what it means to buy a new car. Not just the design on the showroom floor, but the way drivers access the ignition itself.

From that date. all vehicles sold within the European Union must include a standard. preinstalled interface that allows a breathalyzer lock to be added to the ignition system. The measure is part of a broader strategy pushed by EU authorities to reduce drunk-driving-related deaths and injuries by at least 50 percent by 2030.

The requirement lands under the Vision Zero program. launched more than five years ago. with an ambitious aim: eliminate alcohol-related traffic fatalities entirely—or get as close to zero as possible—by 2050. It also lines up with the schedule set out by the EU’s General Safety Regulation. which lays out deadlines for automakers to incorporate specific safety features into vehicles. starting at the factory.

The regulation that becomes mandatory in July obliges automakers to provide an electrical connection and reserve a space inside the vehicle for an “alcolock” device. That device must comply with European standard EN 50436 for Alcohol Ignition Interlocks and have a certificate issued by an authorized accrediting entity.

The way an alcolock works is straightforward. Before starting the vehicle, the driver must blow into the device, which measures the level of alcohol in the breath. If the result exceeds the legal limit. the system—connected to the vehicle’s ignition or starting mechanism—automatically blocks the ignition cycle and prevents the car from starting.

This isn’t completely new technology. Breathalyzer ignition interlocks already operate in several European countries. mainly through programs aimed at repeat offenders of alcohol-related offenses or within certain sectors of professional transport. Official figures estimate that widespread implementation can reduce fatal accidents associated with alcohol consumption by up to 65 percent.

Since 2018, the EU’s road safety program has been building a package of in-vehicle tools meant to reinforce safer driving. As of 2024. new vehicles integrate an intelligent speed assistant that detects the permitted speed limit using cameras or GPS and alerts the driver when the limit is exceeded. There is also an emergency lane keeping assistant that can correct the vehicle’s trajectory when it deviates without prior signaling.

The EU’s list of measures also includes the event data recorder—commonly called a “black box”—which stores key information during the seconds prior to an accident to support law enforcement and traffic safety agency investigations.

More recently, the EU added another requirement: adaptive brake light. With sudden braking, it automatically and intensely activates the rear lights to warn other drivers and help prevent collisions.

The breathalyzer interface is the final step in that sequence of safety changes. As of the first day of July, no car will be allowed to leave a dealership within the EU without full compliance with all these requirements.

This story was originally published by WIRED en Español and has been translated from Spanish.

EU breathalyzer cars alcolock ignition interlock EN 50436 Vision Zero drunk driving safety General Safety Regulation intelligent speed assistant emergency lane keeping assistant event data recorder