Under Section 24220 of the 2021 infrastructure law, the National Highway Traffic Safety Administration owed Congress a final rule on drunk-driving prevention technology in new cars by Nov. 15, 2024. That date passed with no rule, and the agency now has until Nov. 15, 2027, the outer limit the same section allows, to finish one.
What would be finished is a federal safety standard, not a device. Supporters of the law expect carmakers to need two to three additional years after approval to build whatever it requires into passenger vehicles.
The November 2024 deadline NHTSA missed
The statute told the agency to issue a final rule prescribing a Federal Motor Vehicle Safety Standard within three years of enactment. NHTSA’s own advance notice of proposed rulemaking, signed Dec. 12, 2023 under docket NHTSA-2022-0079, quotes the statutory date as “not later than November 15, 2024” and asks the public about technology maturity, consumer acceptance and privacy. The notice centers on alcohol impairment, gives drowsy and distracted driving secondary attention, and leaves drugged driving aside because test protocols for it are insufficient.
The Federal Register version ran on Jan. 5, 2024, with comments due March 5, 2024. An advance notice is the first and lightest step in the process. Between it and a binding standard sit a proposed rule, a second comment round and a final rule, and none of those later documents appears in the record reviewed for this article, which is why the deadline has drifted rather than the date being met.
Section 24220(e) and the three-year extension
Extension authority was written into the statute from the start. The statute carried its own escape valve. NHTSA’s December 2024 report to Congress invokes Section 24220(e), which lets the Secretary extend the timing by up to three years if the requirements cannot be met. Adding three years to Nov. 15, 2024 reaches Nov. 15, 2027, the date AutoGuide gives as the maximum extended deadline and The Drive describes as the new finalization deadline of November 2027.
The same report describes what the agency would do with the time. Its research plan covers work on systems that can passively and accurately detect impairment, objective test methods for measuring breath alcohol concentration, countermeasures for drowsy and visually distracted drivers, and consumer acceptance. The document puts the public response to the advance notice at more than 18,000 comments, and NHTSA told Kelley Blue Book in 2026 that it is still working through the unique comments in that record.
The technology gap NHTSA reported to Congress
The extension rests on a technical admission, and the menu of possible systems is broad: NBC Washington lists air monitors that sample the cabin for alcohol traces, fingertip readers that measure blood-alcohol level and scanners that watch eye and head movement for signs of impairment. The agency’s own concession is blunter. In an early-2026 report to Congress, AutoGuide says, the agency acknowledged that no commercially available technology can accurately and passively detect driver alcohol impairment. AutoGuide also relays NHTSA’s concern that even a system with 99.9 percent accuracy would produce millions of false positives every year across the national fleet, leaving sober drivers stranded.
Kelley Blue Book, reporting in April 2026, quoted an NHTSA statement that the agency “continues to evaluate and analyze the information contained in the more than 3,000 unique comments received” and to conduct the research described in its report. The two counts come from different NHTSA documents, one reporting unique comments and the other the 2024 total.
Lawmakers asking for a calendar
Congress has pushed back on the pace. In a Sept. 19, 2025 letter to NHTSA Administrator Jonathan Morrison, Rep. Debbie Dingell and Sen. Ben Ray Luján said the agency’s report “lacked the legally required timeline and offered no meaningful next steps,” and asked for a revised schedule covering the proposal, comment and final-rule phases.
The delay is contested on both sides. NBC Washington reports, as noted above, that the House defeated an effort to defund the mandate by 268-164 in February 2026, and that opponents, among them Florida Gov. Ron DeSantis, who compared it to Orwell’s “1984,” and automakers worried about false positives, have kept the issue contested even as Mothers Against Drunk Driving calls it the most important legislation in its 45-year history.
Kelley Blue Book describes the extension as “about to expire” as of its April 30, 2026 report, which is consistent with the November 2027 ceiling only if NHTSA relies on the full three years. The length of the compliance window after a final rule rests on supporters’ estimates, not on a published NHTSA compliance date. No proposed rule or compliance schedule appears in the documents reviewed, so the 2027 date marks when the standard is due, not when any car will carry the technology.
Docket NHTSA-2022-0079 on regulations.gov remains the place where the rulemaking record accumulates.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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