When Congress passed the bipartisan Infrastructure Investment and Jobs Act in 2021, most Americans focused on roads, bridges, airports, broadband expansion, and other public works. Buried deep within the thousands of pages of legislation, however, was a provision that has increasingly attracted attention from privacy advocates and constitutional scholars alike.
Section 24220 directs the National Highway Traffic Safety Administration (NHTSA) to develop a federal motor vehicle safety standard requiring what the law calls "advanced drunk and impaired driving prevention technology" in new passenger vehicles.
While the provision was written with the stated goal of reducing alcohol-related traffic deaths, critics argue its broad language opens the door to unprecedented monitoring of drivers inside their own vehicles.
What the Law Says
The law defines advanced impaired-driving prevention technology as a system that can do one or more of the following:
Passively monitor the performance of a driver to accurately determine whether the driver may be impaired and prevent or limit vehicle operation if impairment is detected.
Passively detect a driver's blood alcohol concentration at or above the legal limit and prevent or limit operation.
Use a combination of both approaches.
One phrase has become the focal point of the debate:
"Passively monitor the performance of a driver."
Unlike a traditional ignition breathalyzer that requires a driver to actively blow into a device, the law specifically envisions technology operating continuously and without direct participation from the driver.
What Could "Passive Monitoring" Mean?
The statute itself does not specify what technology manufacturers must use.
Potential technologies under consideration have included:
Driver-monitoring cameras
Eye-tracking systems
Facial analysis
Steering behavior monitoring
Lane-position tracking
Touch sensors
Infrared alcohol detection
Other behavioral monitoring systems
Supporters argue these technologies could detect impairment caused not only by alcohol but also fatigue, drugs, or medical emergencies before tragedy occurs.
Critics, however, see something much broader.
If a vehicle continuously analyzes facial expressions, eye movements, attention, or behavior to determine whether someone is "impaired," they argue that the same hardware could theoretically be capable of observing many other aspects of a driver's behavior.
The law itself does not authorize government surveillance or require that information be transmitted to law enforcement. Nevertheless, privacy advocates contend that once sophisticated monitoring systems become standard equipment in every new vehicle, questions about data collection, storage, cybersecurity, and future uses become increasingly important.
The Privacy Debate
Opponents of the provision argue that Americans have historically enjoyed a reasonable expectation of privacy inside their personal vehicles, even while subject to traffic laws.
They question where the line should be drawn between legitimate safety technology and continuous behavioral monitoring.
Among the concerns raised are:
What data will be collected?
Will recordings be stored?
Who owns the data?
Can manufacturers access it?
Could insurers eventually seek access?
Could law enforcement obtain it with a warrant?
Could future legislation expand its use?
While the current law does not answer these questions, critics argue they deserve public discussion before such technology becomes widespread.
Supporters See a Life-Saving Tool
Supporters of the measure point to sobering statistics.
According to federal traffic safety data, thousands of Americans die every year in crashes involving impaired drivers. They argue that if technology can prevent an intoxicated driver from operating a vehicle before a crash occurs, countless lives could be saved.
From this perspective, passive detection systems are viewed as the next evolution in automotive safety, much like seat belts, airbags, electronic stability control, and automatic emergency braking.
Supporters also note that the statute does not mandate facial-recognition software or require continuous government monitoring.
Instead, it directs NHTSA to develop a safety standard while allowing flexibility in how manufacturers comply.
Has the Requirement Taken Effect?
Despite the law remaining in force, the required federal safety standard has not yet been finalized.
NHTSA has acknowledged that existing technologies still present technical challenges, including concerns about reliability and false positives. As a result, implementation has been delayed while additional research and testing continue.
That means new passenger vehicles are not currently required under Section 24220 to include a specific federally mandated impaired-driving detection system.
A Debate Far From Over
Whether viewed as an overdue safety innovation or the beginning of an expanding surveillance infrastructure, Section 24220 has become one of the most closely watched privacy provisions within the Infrastructure Investment and Jobs Act.
The law itself remains on the books, and federal regulators continue working toward a future safety standard.
The larger question now extends beyond impaired driving.
As automobiles become increasingly connected, automated, and equipped with sophisticated sensors, Americans will continue to debate where safety ends and surveillance begins. Whatever the eventual technology looks like, that conversation is likely to shape not only the future of transportation but also the future of personal privacy in the digital age.
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