The National Highway Traffic Safety Administration (NHTSA) has launched an investigation into Comma.ai’s driver assistance technology following a series of crashes—five in total—related to its “hands-off” system. Among these incidents, two have been fatal, resulting in three deaths overall. As many as 11 other people were seriously injured. The probes focus primarily on failures by Comma.ai’s system to detect or react to slow or stopped vehicles in the same lane.
One tragic accident took place in February 2026 in Ascension Parish, Louisiana. In that event, a 2022 Toyota RAV4 equipped with a third-party fork of Comma.ai’s software—known as FrogPilot—collided with a parked Louisiana State Police vehicle that was fully marked and had its emergency lights on. The state police report confirms two rear-seat passengers in the Toyota died. Other crashes remain under investigation, including one more that resulted in death which has not yet been publicly detailed.
How the Tech Works & What Went Wrong
Comma.ai, founded in 2015 by tech entrepreneur George Hotz, develops aftermarket hardware and a driver assistance system called “openpilot”. This system supplements a vehicle’s existing Adaptive Cruise Control (ACC) and Automated Lane Centering (ALC) features, allowing functions similar to those offered by Tesla Autopilot or GM Super Cruise. It enables the car to steer, accelerate, and brake automatically within its lane—while reminding the driver that manual control must be possible at any moment.
However, a core challenge for many ADAS (advanced driver assistance systems) remains the detection and response to stationary or very slow vehicles in the same lane. Comma.ai’s own documentation acknowledges that openpilot’s ACC may struggle with such scenarios, particularly when abrupt braking is required. The system limits how fast it can decelerate or accelerate in these situations.
Forks, Modifications, and Oversight
The NHTSA’s Office of Defects Investigation flagged that at least one of the fatal accidents involved modified software—so-called forks of openpilot. FrogPilot is one such version. The agency is examining whether these third-party versions performed differently than Comma.ai’s official release, possibly contributing to the crashes.
Comma.ai’s public safety features include a camera-based driver monitor to detect fatigue or distraction in drivers. This system is supposed to ensure that while the tech handles driving tasks under certain conditions, the human behind the wheel stays alert and ready to reengage control. But in cases where a slow or stopped object is in the lane, Comma.ai warns its users that performance may drop, especially when more aggressive braking is needed.
So far, the investigation has focused not just on whether the technology misperforms under specific conditions, but also on whether modified forks bypass safety features or behave unexpectedly. The NHTSA has yet to officially rule whether these forks played a direct causal role in the deaths, but the presence of modified software has become a central concern.
The company’s co-founder, George Hotz, stepped away from day-to-day operations in 2022 and has not responded to inquiries related to these incidents. Comma.ai has stated publicly that users must remain ready to take over control at any time. That said, these fatal cases raise questions about how effective that requirement is in practice.
While Comma.ai isn’t alone—several automakers’ driver assistance systems have also been under scrutiny for similar failures involving stationary objects—the inclusion of third-party forks poses unique regulatory and safety challenges. Authorities will need to decide how to treat modified versions of technology that may not conform to a company’s safety design or testing.
This ongoing NHTSA probe will scrutinize not only technical performance under varied road conditions, but also how Comma.ai addresses—or limits—the use of forks and open-source derivatives. As the system becomes more accessible, ensuring adherence to safety constraints—both in official builds and modified variants—will be critical.
Analysis: Comma.ai’s hands-off driving tech has reached a watershed moment. As scrutiny from regulators mounts—and with fatalities now tied to modified forks—the industry may face pressure to enforce stricter controls on aftermarket alterations and ensure robust detection of stationary objects. For consumers, it underscores that driver monitoring and warnings are not just legal disclaimers—they’re essential guardrails. Authorities’ findings here could reshape how hands-off ADAS systems are developed, distributed, and regulated going forward.
