Short answer: yes, it is legal. NHTSA amended federal headlight regulations in February 2022 to explicitly permit adaptive driving beam systems — the technology behind Audi Matrix headlights. Here is the full picture.
Unlocking Matrix headlights on your US-spec Audi is legal. The US federal standard that previously made adaptive high beam systems a grey area was updated in February 2022. Since then, adaptive driving beam (ADB) headlighting systems — which is exactly what Audi's Matrix LED is — are explicitly permitted on US roads.
Your Audi already has the hardware installed. RetroLab Pro re-enables the software your car came with. No hardware is changed, no non-OEM parts are added, and no laws are violated.
For decades, US Federal Motor Vehicle Safety Standard (FMVSS) No. 108 required headlights to operate in one of two fixed states: low beam or high beam. This prevented adaptive segmented beams that could dim individual sections to avoid blinding other drivers — even though such systems had been standard in Europe for years.
On February 18, 2022, NHTSA published a final rule amending FMVSS No. 108 to add a new voluntary compliance option for Adaptive Driving Beam (ADB) headlighting systems. The rule defines ADB as a forward lighting system that adapts automatically to avoid excessive glare to other road users while maximising illumination for the driver.
Audi's Matrix LED system is a textbook ADB system. Each Matrix LED headlight contains independently controllable segments that mask oncoming vehicles and cyclists in real time — precisely the functionality the new rule governs and permits.
Before the rule change, manufacturers could not certify ADB systems under FMVSS 108, which is why Audi shipped US cars with the Matrix functionality locked. After the rule change, there is no federal prohibition on ADB operation.
The NHTSA ADB amendment applies to vehicles operating on US roads — not just new vehicles manufactured after 2022. The rule change removes a regulatory barrier that previously prevented ADB operation. If your Audi has factory Matrix LED hardware (PR-code 8G4 or 8G5), that hardware was designed to operate as ADB. Activating it through RetroLab Pro restores the OEM-intended function.
Key points:
Headlight regulations in the United States operate at two levels: federal (FMVSS, which governs vehicle manufacturing and equipment standards) and state (which governs vehicle operation and inspection).
Federal level: The NHTSA ADB amendment cleared the path at the federal manufacturing standard level. Vehicles with ADB systems can now be certified as complying with FMVSS 108.
State level: Most states reference FMVSS 108 for equipment standards. States do not independently define the technical operating requirements for adaptive headlight systems — they defer to the federal standard for what counts as compliant equipment. A vehicle with factory-installed, software-enabled Matrix LED is not "modified" in the sense that state inspection programs care about.
No US state has a law specifically prohibiting the software-enabled operation of factory-installed adaptive LED headlight hardware. If you are ever asked about it at a vehicle inspection, the factual answer is that your car has OEM headlights operating within their factory-intended specification.
The practical risk is close to zero. Matrix headlights on US Audi vehicles are designed to meet or exceed the beam pattern requirements of both the old and new FMVSS 108 standards — Audi engineered the systems to comply with international safety requirements that are, in most respects, stricter than US standards were.
The activation does not make headlights brighter than the OEM design. It restores the adaptive masking behaviour that prevents glare — making your headlights safer for other road users, not less safe. The system is the same one that has operated legally in the European Union since 2013.
RetroLab Pro also performs a full pre-activation VIN check to confirm your exact headlight hardware and configuration before any changes are made. The process is reversible.
Find your model page below and submit your VIN for a free compatibility check. You only pay once we confirm the activation is supported for your specific car.