Tesla FSD v14.3.9 Adds Automatic Collision Evasion on Highways

Tesla’s Full Self-Driving Supervised v14.3.9 rollout includes Automatic Collision Evasion, a new safety path that can steer around an imminent frontal crash when braking alone may not be enough, or pull FSD back on if the car decides the driver is not paying attention, according to the feature’s in-car release notes that started shipping with the update on September 8, 2026.

On controlled-access highways, when a Model Y detects an imminent frontal collision with another vehicle and braking alone may be insufficient, Automatic Collision Evasion may engage if steering around the obstacle is more likely to avoid the crash than straight-line Automatic Emergency Braking. The notes say the maneuver can include changing lanes or moving onto the shoulder, with braking or accelerating as needed, then continuing to drive. The feature is enabled whenever both Automatic Emergency Braking and FSD Supervised are enabled, and it only steers in that frontal-collision case when the car is under 85 mph (137 km/h), no pedestrians or cyclists are in the path, the road is not detected as wet or slippery, and the driver is already in manual control with FSD available but not active.

While the evasion is running, the accelerator is muted and pressing the brake slows the car without canceling the maneuver; canceling requires firm, deliberate steering with more force than a normal FSD cancel. The car sounds a chime and shows a brief take-over prompt, then drops into a limited FSD Supervised state afterward. In other collision layouts, such as pedestrians, cyclists, head-on traffic, or cross traffic, or outside those highway conditions, Automatic Collision Evasion does not steer and Automatic Emergency Braking stays the active path.

A second mode can engage off the highway when the car detects the driver is not sufficiently attentive or that FSD may have been unintentionally disengaged, between about 22.5 mph and 85 mph, then continues under normal FSD Supervised control. Hardware 4 owners have been further ahead on the v14.x supervised stack, while Hardware 3 cars remain on the Lite path in many markets, so the Collision Evasion language in these notes is tied to the v14.3.9 Model Y rollout described on screen. That sits beside other September FSD notes on the site, including Tesla’s roadside offset for pedestrians and cyclists and the unconfirmed v14 Lite tip for HW3 Model S and X.