NHTSA has definitively rejected a petition claiming Tesla's one-pedal driving system causes sudden unintended acceleration (SUA) crashes, attributing the incidents to driver error despite the company's assertions of recurring patterns. The agency determined that adding a brake interlock to 2.3 million vehicles is unnecessary, as the system is industry-standard. Simultaneously, NHTSA escalated its investigation into Tesla's FSD system, citing failures to detect degraded camera visibility in glare and airborne obscurants, potentially impacting over 3.2 million vehicles. The probe now includes six additional crashes, raising concerns about underreported incidents and the system's reliance solely on cameras without complementary sensors like radar or lidar.

Tesla's FSD software relies on camera degradation detection to alert drivers when vision is compromised, but NHTSA found the system often failed to warn drivers appropriately just before crashes. The agency highlighted nine crashes where the system didn't detect common visibility-impairing conditions like glare. While Tesla maintains FSD's safety, the expanded probe signals increased regulatory scrutiny, potentially leading to a significant recall if defects are confirmed. The outcome underscores the challenges of deploying vision-only autonomous systems in complex real-world environments.

The rejection of the SUA petition leaves Tesla's one-pedal system intact, but the FSD investigation represents a major escalation. NHTSA's findings suggest fundamental limitations in Tesla's approach, potentially forcing the company to integrate additional sensor technologies or face a massive recall. The agency's actions highlight growing regulatory pressure on companies deploying advanced driver-assistance systems without traditional sensor suites, setting a precedent for future oversight in the autonomous vehicle landscape.