Will All New Cars in the UK Have Breathalysers and Black Boxes in 2025?

If you’ve recently asked yourself this question—you’re not alone. A new set of UK government proposals may soon make alcohol interlocks (breathalysers) and event data recorders (black boxes) mandatory in all newly manufactured cars. The goal: tackle drink-driving and improve road safety.

But what does this mean for you as a learner driver, a parent supervising lessons, or a professional driving instructor?

Let’s break down what’s happening, how likely it is, and what to prepare for.

🚨 What Are the New Proposals?

The Driving Instructors Association (DIA) reported in August 2025 that the government is actively reviewing measures to curb drink-driving and reckless behaviour through in-car tech enforcement:

• Mandatory breathalysers that prevent a vehicle from starting if the driver is over the legal alcohol limit.
• Permanent black box systems to monitor driving behaviour—tracking speed, braking, location, and crash data.
• These devices could become a legal requirement in all new vehicles sold in the UK—possibly aligned with similar EU vehicle safety regulations already in place since 2022.

According to the DIA, policymakers believe tech-based enforcement may reduce the 260+ annual UK drink-driving deaths.

Source: Driving Instructors Association News

🔎 How Do These Technologies Work?

Alcohol Interlock / Breathalyser

• The driver must blow into a breathalyser unit before starting the vehicle.
• If the blood alcohol level exceeds the legal limit, the car won’t start.
• Already in use in parts of Europe for repeat drink-driving offenders.

Black Box / Event Data Recorder

• Records data like speed, location, braking, and cornering habits.
• Often used by insurance companies for young drivers (telematics policies).
• Helps determine fault in collisions and spot unsafe driving patterns.

These features could become mandatory for all drivers, not just high-risk or newly qualified ones.

🎓 What Driving Instructors Should Know

Driving schools may soon need to adjust both vehicle choice and lesson content:

• Instructors using new fleet cars from 2025+ may be required to have black boxes and interlocks installed.
• Pupils may need to learn how to interact with breathalyser systems—including why it matters and how to test properly.
• If black box data becomes legally shareable, instructors might even be asked to submit driving behaviour data during lessons.

👉 Prepare learners early: Teach the value of safe, consistent driving—because black boxes will track every move.

🚘 What Learner Drivers and Parents Need to Know

If these proposals become law, even private practice may change:

• Parents supervising practice may need to blow into an interlock device before a learner can start the engine.
• Some learner cars may come with built-in black boxes—especially electric or hybrid models.
• Insurance costs could decrease for responsible learners thanks to better telematics data.

It’s a new world of transparency: bad habits are now recorded—and good habits rewarded.

🧭 What Happens Next?

This isn’t law yet, but things are moving fast:

• The UK could align with EU General Safety Regulation rules requiring data recorders and alcohol interlocks in all new cars.
• Consultations are underway with vehicle manufacturers, safety groups, and insurance providers.
• Legislation could roll out as early as late 2025 into 2026.

Instructors and learners should begin preparing now—not when it’s already law.

🧠 Final Thoughts

So, will all new cars in the UK soon come with built-in breathalysers and black boxes? Very possibly. And driving schools that prepare for this shift will be a step ahead.

It’s not just about passing a test anymore—it’s about being part of a safer, more accountable driving culture.

“Technology is becoming the backseat driver—quietly watching, judging, and keeping you safe.”

Stay informed, stay ready—and help your pupils become safer drivers in a rapidly changing world.