Almost five years ago, Congress mandated that the federal government create technology capable of disabling a vehicle if it detects that the driver is impaired.
However, the National Highway Traffic Safety Administration (NHTSA), the agency tasked with establishing how this technology should operate, has yet to finalize any regulations or even propose any.
NHTSA acknowledged the potential complications, stating that stopping a vehicle mid-traffic could lead to “significant unintended consequences.”
Moreover, the NHTSA has recognized a major issue affecting all drivers: the existing technology is not reliable enough.
In a report submitted to Congress in February, NHTSA revealed that current systems for detecting impaired driving lack the necessary precision, speed, and reliability for federal implementation. The agency highlighted an “unacceptably high” error rate in technology regarding alcohol detection at the legal limit.
So, what are the potential consequences?
NHTSA estimates that Americans undertake about 227 billion driving trips each year. Even a system with an impressive 99.9% accuracy could mistakenly prevent millions of sober drivers from operating their vehicles or fail to stop impaired drivers from driving.
This aspect of the “kill switch” discussion certainly deserves more scrutiny.
Road safety concerns
In 2021, Congress enacted the Infrastructure Investment and Jobs Act, which President Joe Biden signed on November 15. Under Section 24220, the Department of Transportation, via NHTSA, was directed to set a federal vehicle safety standard for advanced technology that prevents drunk and impaired driving in new passenger cars.
The objective is clear and commendable: to reduce fatalities and injuries from impaired driving. There’s no dispute regarding the unacceptability of drunk driving, nor does anyone want innocent victims hurt due to someone driving under the influence.
The real question revolves around the implications of having the government mandate a device to determine one’s ability to drive.
Section 24220 considers technology that can monitor driver behavior passively, detect the blood alcohol concentration at or above the legal threshold, or use both methods together.
The critical point, though, is that this technology must effectively prevent or limit vehicle operation if impairment is detected.
This goes far beyond just adding an alert light to the dashboard.
Criticism of the law
Some have referred to Section 24220 as the “kill-switch law.” This label can be misleading, so it’s important to clarify what the law does and does not entail.
It does not create a universal control that allows authorities to turn off every person’s car at will. There are no specifications for a single type of camera, algorithm, or technology. Moreover, it does not require that a vehicle simply shut off while in motion.
The eventual federal standard—if NHTSA can formulate one—will dictate how these requirements will function.
Nevertheless, the law explicitly states the need for technology capable of halting or restricting vehicle operation after potential impairment is flagged. NHTSA is already considering actions to take once impairment has supposedly been recognized.
They also admit that stopping a vehicle before a trip begins can be different from intervening once the vehicle is already in motion, which poses greater dangers. It’s pretty obvious, right?
Practical concerns
This is where the subject shifts from theory to real-life implications. What if the system wrongly flags you as impaired when you’re actually sober? Can you take action to override it? How fast would you be able to do that?
What happens if you’re in a rush for work? Picking up your child? Attending a medical appointment? Responding to an emergency?
NHTSA claims that they are working to reduce false positives, which could hinder sober drivers. However, their latest findings also concede that they currently lack technology that can achieve the needed accuracy while minimizing false results.
Most of the technologies they reviewed are still in early development stages or are not suited for production vehicles.
Some systems, such as touch and breath sensors, are still being refined. Others, like camera-based monitoring, evaluate eye movements, facial features, or vehicle behavior to determine potential impairment. NHTSA is still facing fundamental challenges in creating reliable tests to validate these technologies for establishing a federal safety standard.
In simpler terms, Congress has imposed a requirement before regulators had a sure technology that could meet it.
Regulatory delays
Congress initially instructed NHTSA to finalize the standard by November 15, 2024.
That deadline, however, did not occur.
The law permits the Department of Transportation to take more time if it determines a viable standard hasn’t yet been established. Instead, NHTSA has continued researching and reporting back to Congress.
By 2026, advanced impaired-driving technological regulations remain at the pre-rule stage, with NHTSA assessing the feedback following its 2024 Advance Notice of Proposed Rulemaking.
This means there isn’t a schedule for when all new cars will suddenly have this technology. A compliant final standard is still not in place.
Once such a rule is eventually made, it normally takes two to three years for the requirement to come into effect.
This gives regulators time, and they should definitely make use of it.
RELATED: Exploring the evolving nature of traffic stops as technology and AI become prominent.
Technology needs to prove effective
Drunk driving leads to preventable deaths. Technology capable of reliably stopping intoxicated drivers could indeed save lives.
However, having a mandate from Congress does not automatically make immature technology dependable.
NHTSA’s research underscores a central dilemma. A system designed to restrict vehicle operation must function with exceptional accuracy; any minor error rate—multiplied across billions of trips—can yield numerous mistakes.
Before Washington enforces this technology in all new passenger vehicles, drivers need clarity.
What conditions will initiate a reaction? What actions will the vehicle take? What happens if impairment is suspected while already driving? Can a sober driver contest a false alarm? How will manufacturers demonstrate their technologies’ reliability? And ultimately, who takes responsibility when these systems fail?
No one wants impaired drivers on the road. But equally, people don’t wish to fall victim to a “kill-switch incident” resulting from a faulty system.
