I am requesting a serious investigation into potentially life-threatening steering, braking, and stability-control interventions in modern vehicles. I have experienced unexpected steering forces, directional changes, shaking, and behavior consistent with unintended wheel-specific braking across multiple vehicles, including my 2019 Toyota Prius and rental vehicles from several manufacturers. These behaviors occur on ordinary roads with uneven asphalt, pavement seams, manhole covers, and cross-slopes. I am...
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concerned that electronic steering, stability control, wheel-speed sensors, or driver-assistance systems may be interacting incorrectly. How can these features be considered safe if their interventions can push a vehicle toward another traffic lane or into a bicycle lane? The risk is especially serious during freeway lane changes, when drivers must simultaneously monitor traffic ahead, approaching vehicles behind, blind spots, and available space. An unexpected steering or braking intervention at that moment can create a dangerous loss of control. I am also concerned that drivers may lack a meaningful way to disable certain interventions, even when they believe the systems are creating danger. I previously submitted complaint 11669864 and was informed that more complaints might be necessary before an investigation could begin. A potentially life-threatening defect should not be dismissed simply because insufficient reports have accumulated. I request that NHTSA review my existing complaint, assess whether unintended steering or braking interventions can cause dangerous directional changes, examine driver override limitations, and determine whether a broader investigation is warranted. I consider these behaviors potentially LIFE-THREATENING. A feature's intended safety purpose does not guarantee that its interventions are safe. Drivers, passengers, and nearby motorists and cyclists not be exposed to avoidable hazards from systems intended to protect them.