In recent years, automakers and tech companies have moved from experimenting with biometric concepts to deploying real-world solutions for unlocking and starting vehicles. Facial-recognition cameras on door handles or B-pillars, fingerprint sensors embedded in handles or ignition panels, iris and retina scanning — all of these are now part of a growing movement to make cars more personal, convenient, and secure.

The business behind this shift is significant. The market for biometric vehicle access systems was estimated at over US$ 546.3 million in 2024, and analysts project it will grow to more than US$ 1.56 billion by 2034, representing a compound annual growth rate of 11.1%. [1] Fingerprint recognition leads the adoption among authentication types today — partly because fingerprint sensors tend to be simpler to implement reliably, and partly because fingerprints are a familiar biometric modality thanks to smartphones and other consumer devices.

Among automakers deploying biometrics, one of the earliest movers was Hyundai, which introduced fingerprint-based entry and start in models like the 2019 Santa Fe SUV. Their system uses a capacitive fingerprint reader. According to testing, the chance of misidentifying an unauthorized fingerprint is around 1 in 50,000 — about five times more secure than conventional vehicle keys, including many smart-key systems. [2]

The New Key in Your Pocket — Or Rather, On Your Face or Finger

Meanwhile, facial recognition is rapidly gaining ground as computational power and AI-driven recognition algorithms improve. In-vehicle face recognition works by capturing an image of the driver, extracting geometric measurements — the distance between eyes, the shape of the cheekbones and chin, the placement of facial landmarks — then comparing that with a stored template to verify identity. [2]

(Image from E-mobility Engineering, the copyright belongs to the original author)

Researchers are also working to expand the scope of biometrics beyond convenience. For instance, recent academic work has produced the iCarB dataset, which includes face videos, fingerprint images, and voice samples collected from individuals seated in real vehicles — indoors and outdoors, under different lighting, and with environmental “noise.” This dataset lets developers test and benchmark multimodal biometric recognition systems — systems that might combine facial recognition, fingerprint authentication, and even voice recognition to maximize security and reliability.

Going one step further, biometrics could soon enable features beyond locking and unlocking. In-vehicle payment systems have been proposed, where a dash-cam or cabin-mounted sensor uses face or voice recognition to identify the driver or passenger, that identity is authenticated against a credential stored on their smartphone, and then payment is completed seamlessly. This kind of frictionless payment starts to transform cars into more than transportation devices — they become part of a broader digital lifestyle ecosystem.

What Biometric Cars Give And What They Demand?

Security and Theft Prevention

Traditional keys and even smart-fobs come with vulnerabilities: they can be lost, stolen, cloned, or compromised via relay attacks. Biometric authentication — fingerprints, faces, irises — leverages biological markers unique to each individual, which can’t be easily duplicated. That means unauthorized entry becomes much harder, and hot-wiring or relay-based theft attempts become less useful.

Moreover, biometric systems often raise the bar by combining multiple authentication layers. Some implementations may require fingerprint + PIN, or face + voice, or even offer fallback methods.

Especially in high-theft or high-risk regions, fingerprint-based ignition systems have been proposed as a deterrent not just to theft — but to carjackings.

Personalization and Convenience

Once a car recognizes who you are, it can adapt automatically to your preferences. Seat position, steering-wheel angle, mirror placement, climate controls, infotainment settings — all can be stored per user profile and loaded instantly upon recognition.

For households or situations where multiple people share a vehicle — family members, car-sharing, rental fleets — biometric profiles mean each user gets their own “experience,” without fumbling through menus or manually adjusting everything each time.

And the convenience of not needing physical keys or fobs — especially ones that can be lost, drained, or malfunction — is a major plus. Unlocking by simply approaching the car, starting with a fingerprint or glance, reduces friction and can save time.

Innovation Beyond Access — Biometric-Driven Services

Biometric integration opens doors beyond access control. The concept of in-vehicle payments using biometrics is already being researched: a system where a dash-cam or cabin sensor identifies a user by face or voice, confirms their identity against a credential stored on their phone, and allows payment for tolls, parking, gas, or other services — all without touching a wallet or smartphone — has been prototyped.

In the future, biometric data could enable adaptive safety systems: for example, monitoring driver attentiveness, fatigue, or stress levels. Detection of drowsiness, distraction, or impairment could trigger preventive interventions — alerts, automatic slow-down, or even autonomous interventions — improving safety on the road. [3]

Also, as biometric data becomes part of the vehicle’s internal profile, automakers may offer dynamic adjustments not just for drive settings but for entire mobility services — customizing shared rides, rental cars, and subscription-based mobility on the fly. The car becomes less “a thing” and more “your thing.”

The growing body of research — including datasets like iCarB — will likely accelerate development of more robust, multi-modal biometric systems, combining face, fingerprint, voice, potentially even iris/retina or behavioral biometrics (driving patterns, seat pressure, voice stress) for higher accuracy and better user experience.

The Dark Side of a Car That Knows You — Challenges Ahead

Technical & Reliability Hurdles

Biometric sensors must operate across a wide range of real-world conditions — bright sunlight, darkness, rain, snow, cold, humidity, moisture, dirt, gloves, hats, sunglasses. All these can interfere with facial recognition or fingerprint reading. While modern algorithms have improved substantially, there is still room for error or occasional misrecognition.

Even fingerprint scanners, which are often seen as more reliable, are not immune: a wet, greasy, scratched or injured finger can fail to read; wear on the sensor, dirt or debris, or adverse lighting can degrade performance. Some implementations still keep a fallback — a physical key or fob — for just such cases.

And when biometric systems malfunction — e.g., sensor fails, software bug, power issues — there must be a reliable fallback so the owner is not stranded outside their car. Managing that fallback without undermining security or convenience remains a design challenge.

Privacy, Data Security, and Ethical Considerations

Collecting biometric data — face scans, fingerprint templates, voice samples — brings inherent privacy challenges. Unlike a physical key, your fingerprint or face is immutable; if biometric data is compromised, you cannot simply “change” your fingerprint.

Because of this, experts emphasize the need for robust data protection measures: encryption, secure local storage, anonymization or hashing of templates, and strict controls to ensure biometric data never leaves the vehicle unless explicitly permitted. In some cases, “private biometrics” — encrypted templates that can be matched without ever exposing raw biometric data — are being proposed for vehicles.

Beyond technical safeguards, there is a broader ethical and regulatory dimension. As cars collect more biometric and behavioral data, they become, in a sense, surveillance devices on wheels. Data about driving behavior, location history, who you are, how you behave — all potentially accessible if not properly protected. Some advocacy groups classify connected cars among the worst privacy liabilities.

Cost, Market Penetration, and Consumer Acceptance

Implementing biometric systems — cameras, sensors, encryption modules, authentication software — adds cost to vehicle manufacturing. Consequently, these features have so far been limited mostly to premium or luxury models. Biometric access and personalization should trickle down to mid-range and everyday vehicles. Market analysts predict the entire biometric-vehicle access segment growing steadily over the next decade.

Yet consumer opinions remain mixed. According to a recent industry study, while tech-savvy buyers tend to praise biometric convenience and novelty, a substantial portion remain skeptical — some see it as solving a problem they don’t have, others worry about reliability or privacy. [4]

Sources:

[1]: https://market.us/report/biometric-vehicle-access-systems-market

[2]: https://www.emobility-engineering.com/automotive-biometrics

[3]: https://theautocircuit.com/biometrics-car-security-and-customization

[4]: https://www.biometricupdate.com/202502/biometrics-rolling-towards-relevance-for-automakers-and-drivers

References:

https://www.nexomen.com/post/biometric-car-access-systems-future-vehicle-security

https://arxiv.org/abs/2411.17305

https://www.automotive-technology.com/articles/biometric-technologies-in-automotive-security-and-access-control

https://news.bloomberglaw.com/us-law-week/cars-biometric-features-must-evolve-to-ease-privacy-concerns