The National Highway Traffic Safety Administration (NHTSA) has opened a preliminary investigation into Tesla's Full Self-Driving (FSD) system following documented cases of vehicles running red lights and violating traffic safety laws. The agency has identified 2.88 million Tesla vehicles equipped with FSD that exhibited concerning behavior, including running red lights, driving against proper lane direction during lane changes, and failing to come to complete stops at intersections. This investigation represents a significant regulatory moment for Tesla's autonomous driving ambitions and comes as the company faces mounting legal and safety challenges.

What Specific Safety Issues Triggered the NHTSA Investigation?

The NHTSA's preliminary evaluation was sparked by a troubling pattern of incidents documented across Tesla's FSD user base. The agency confirmed six specific reports in which a Tesla vehicle using FSD "came to an intersection with a red traffic signal, proceeded to travel into the intersection despite the red signal and was later part of a crash with other motor vehicles in the junction". Four of these crashes resulted in injuries to vehicle occupants. Beyond red light violations, investigators identified 18 complaints and one media report claiming that Tesla cars operating with FSD engaged "did not stay stationary for the duration of a red light, did not come to complete stop, or failed to accurately detect and show the proper traffic signal state in the car's display".

The safety concerns extend beyond intersection behavior. Several reports indicated that FSD "failed to give alerts of the technology's intended actions as the vehicle was approaching a red light," leaving drivers without adequate warning that the system might behave unexpectedly. These gaps in driver notification are particularly concerning given that Tesla markets FSD as a system requiring constant human attention and intervention.

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How Does This Investigation Fit Into Tesla's Broader Regulatory Challenges?

The current NHTSA investigation is not Tesla's first brush with federal safety scrutiny, nor is it the most advanced. The agency is simultaneously pursuing multiple lines of inquiry into Tesla's driver-assistance systems, each at different stages of the regulatory process. Understanding the landscape of these investigations reveals the depth of regulatory concern about Tesla's autonomous driving technology.

• Red Light and Traffic Violation Probe: The newly announced preliminary evaluation examining 2.88 million vehicles for red light running and improper lane changes represents the earliest stage of NHTSA's investigative process, which can eventually lead to recalls if safety defects are confirmed.
• Reduced Visibility Investigation: A separate and more advanced inquiry has escalated to the engineering analysis stage, examining 3.2 million Tesla vehicles after the agency found that FSD struggled to detect and warn drivers in conditions such as fog and sun glare, with at least one fatal pedestrian crash linked to this deficiency.
• Historical Scrutiny: The NHTSA has examined Tesla's driver-assistance systems for years, including a 2024 crash near Seattle in which a vehicle using FSD struck and killed a motorcyclist, demonstrating a pattern of serious incidents.

The regulatory pressure extends beyond federal investigations. In August 2025, a Miami federal jury returned a verdict of approximately $243 million in a 2019 Autopilot crash that killed 20-year-old Naibel Benavides Leon and gravely injured her boyfriend, finding the system defective. In February 2026, a judge rejected Tesla's bid to overturn that judgment, ruling that the evidence "more than supported" the jury's decision and exhausting the company's options at the trial-court level. Since that verdict, Tesla has quietly settled several additional Autopilot crash lawsuits rather than risk further jury decisions.

What Happened in the Recent Texas Crash That Renewed Scrutiny?

A fatal crash in Katy, Texas, has brought renewed attention to questions about driver responsibility and system reliability. On Friday night, a Tesla Model 3 crashed through the front of a house at high speed, striking 76-year-old Martha Avila, who was standing in the front room. Avila was airlifted to Memorial Hermann hospital, where she later died from her injuries. The driver, identified as 44-year-old Michael Butler, told deputies he had the Tesla on autopilot at the time of the crash.

However, the account that the car was driving itself comes solely from the driver, and investigators have not confirmed that any automated system was engaged, let alone that one caused the crash. The Harris County Sheriff's Office Vehicular Crimes Division is leading the investigation, examining the vehicle's automated systems, the driver's actions, and the speed at which the car was traveling before impact. Crucially, Butler showed no signs of intoxication and has cooperated with officers throughout, and no charges had been filed as of Saturday afternoon.

The distinction between Tesla's two driver-assistance products matters significantly in such investigations. Tesla markets both the older Autopilot system and the more advanced Full Self-Driving, now branded "Full Self-Driving (Supervised)," and both require a fully attentive driver ready to intervene at any moment. Neither is an autonomous system, and the company states that drivers remain responsible for the vehicle at all times. Yet the Katy crash illustrates the real-world confusion that can arise when drivers invoke these systems in emergency situations.

How to Understand Tesla's Current Position on Driver Responsibility?

Tesla's official messaging about FSD has remained consistent even as regulatory and legal pressure mounts. The company maintains that FSD is "intended for use with a fully attentive driver, who has their hands on the steering wheel and is prepared to assume control at any time". According to Tesla's position, while these capabilities are designed to improve over time, the currently enabled features do not make the vehicle self-driving. This framing places ultimate responsibility on the driver, a position that has been tested repeatedly in court and regulatory proceedings.

• System Limitations: Tesla explicitly states that FSD requires constant human attention and is not a fully autonomous system, meaning drivers must be prepared to take control immediately if the system behaves unexpectedly or encounters situations it cannot handle.
• Ongoing Development: The company acknowledges that FSD capabilities are designed to improve over time, suggesting that current versions may have limitations that future updates will address, though this does not excuse current safety issues.
• Legal Liability: Tesla's position that drivers remain responsible for the vehicle at all times has been challenged in court, with juries finding the company partly liable even when drivers were distracted, breaking through the traditional defense that an inattentive driver alone is to blame.

The gap between Tesla's stated intentions and real-world outcomes has become the central tension in regulatory and legal proceedings. Drivers may believe they can rely on FSD more than the system's design actually permits, while regulators are increasingly skeptical that current implementation adequately protects public safety.

What Does This Mean for Tesla's Robotaxi Ambitions?

The timing of these investigations and the Texas crash is particularly significant given Tesla's broader autonomous vehicle strategy. Tesla launched a limited robotaxi pilot in Austin in June 2025, using Model Y vehicles overseen by a human safety monitor, and the rollout quickly drew regulator attention after videos showed cars driving on the wrong side of the road and braking erratically. By mid-2025, the company had begun offering driverless employee rides in Austin without safety operators on board, a step toward removing the human monitor entirely.

Until now, Tesla's expansion of its robotaxi service with Model Y SUVs has been slower than expected, according to non-official trackers. The mounting regulatory scrutiny of FSD's core safety systems suggests that Tesla's path to full autonomous operation faces significant headwinds. Each new investigation, crash, or court verdict adds pressure on the company to demonstrate that its technology is genuinely safe before expanding driverless operations beyond limited pilot programs.

The NHTSA's preliminary evaluation is the first step in a process that can lead to recalls if the agency concludes vehicles pose a risk to public safety. For Tesla, the outcome of these investigations will likely shape not only the future of FSD as a consumer feature but also the viability of the company's robotaxi ambitions, which depend on proving that autonomous driving technology can operate safely without human intervention.