Federal officials have started a process to review U.S. vehicle-lighting standards, including headlight glare—but the government has not announced a finished fix, new glare limits or a date when any changes would take effect. On October 6, 2026, the National Highway Traffic Safety Administration (NHTSA) said it would use negotiated rulemaking to modernize Federal Motor Vehicle Safety Standard No. 108, which covers vehicle lamps and related equipment.
What the federal action does—and does not do
NHTSA’s October 6 announcement launches a collaborative standards-review process. It is not a final rule, and it does not establish a new glare threshold or promise that future standards will eliminate glare. The agency says the review will consider headlight glare as part of a broader update to FMVSS No. 108. NHTSA’s announcement describes modernization as a way to address potential causes of glare and improve safety; that is the agency’s policy framing, not evidence that glare has already been solved.
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The process will examine LEDs, dusk sensors, automatic high beams, replaceable light sources, headlamp height and aim, test procedures for plastic optics and replaceable lenses, and alignment with international standards. NHTSA says Transportation Secretary Sean P. Duffy will appoint up to 18 stakeholders from groups including manufacturers, equipment associations, safety organizations, research institutions and engineering associations. The final committee membership and the eventual requirements have not been announced.
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How the 2026 review differs from the existing adaptive-headlight rule
Adaptive driving beam (ADB) headlights are already permitted for certification on new U.S. vehicles under a separate NHTSA final rule issued in 2022. That rule addressed a specific beam-control technology; the new process is a wider review of the federal lighting standard.
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| Action | Status | Scope | What is established |
|---|---|---|---|
| 2022 ADB rule | Final rule | Amended FMVSS No. 108 to enable certification of ADB systems on new vehicles sold in the United States. | ADB certification is permitted under the rule. The NHTSA-hosted rule document is a prepublication copy and directs readers to the official Federal Register version for the official text. Read the NHTSA-hosted rule document. |
| 2026 negotiated rulemaking | Process announced; no final rule yet | Broader modernization of FMVSS No. 108, including glare, technologies, performance, test methods and international alignment. | No new numeric glare limits, final regulatory text or implementation date were included in the announcement. Read NHTSA’s announcement. |
What adaptive driving beams do—and why they are not a guaranteed cure
ADB is a beam-control behavior, not another name for LED headlights. NHTSA describes ADB systems as automatically directing less light toward occupied areas of the road and more toward unoccupied areas. In principle, that can help a driver see pedestrians, animals or objects while reducing light aimed at other vehicles. NHTSA explained the 2022 rule when it allowed these systems to be certified on new vehicles.
Whether a system controls glare effectively depends on its performance and the conditions it encounters. In a 2015 assessment of European-specification ADB-equipped light vehicles using adapted ECE test scenarios, NHTSA found that the tested systems dynamically shaded oncoming and preceding vehicles. Many test cases nevertheless exceeded the report’s derived lower-beam glare comparison values, particularly on curves when both vehicles were moving. Those findings describe that historical test program; they do not establish how every current system performs or how later U.S. compliance testing applies. Read NHTSA’s 2015 ADB glare assessment.
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The assessment reported comparison values of approximately 3.109 lux at roughly 15 meters and 0.634 lux at 60 meters. They were derived from 2011 University of Michigan Transportation Research Institute work and are research comparisons—not federal glare limits adopted in 2026.
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Glare is affected by more than the lamp’s light source. NHTSA’s report to Congress on nighttime glare and driving performance identifies mounting height, aim, light source and beam-intensity patterns as relevant factors. The report also discusses vehicle loading and headlamp replacement as possible causes of changes in aim, and describes potential responses such as aim checks, different beam distributions for different mounting heights, adaptive-lighting tests, and lens or windshield maintenance. These are approaches discussed in that report, not requirements announced in the current rulemaking. Read NHTSA’s report on nighttime glare and driving performance.
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What drivers can do about a suspected aiming problem
If another driver’s headlights seem unusually high or glare from your own vehicle changes after a repair, replacement or change in load, a headlamp aim and installation check may be relevant. Follow the vehicle manufacturer’s procedures or ask a qualified service professional to inspect the lighting. A general article cannot diagnose a particular vehicle or determine whether its lamps meet applicable requirements.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to participate in the 2026 process
NHTSA set November 9, 2026, as the deadline for comments on the rulemaking’s scope and the balance of the stakeholder committee, as well as formal committee membership nominations. The agency identifies regulations.gov docket NHTSA-2026-1981. This is a deadline for input on the process and committee—not a deadline to comment on a published substantive proposed rule.
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- Go to the NHTSA-2026-1981 docket on Regulations.gov.
- Review the docket materials and the instructions for submitting comments or a committee nomination.
- Submit the relevant material by November 9, 2026, following the docket’s instructions.
NHTSA has not announced the final committee roster, the text of a future proposed or final rule, or when any resulting requirements would take effect.
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