Tesla's latest FSD update introduces a safety feature that changes an important assumption about Full Self-Driving:
FSD may now intervene even when you're driving manually.
With FSD (Supervised) v14.3.9, Tesla is rolling out Automatic Collision Evasion, a new active-safety feature designed to intervene in certain situations where the vehicle believes a collision is imminent and braking alone may not be enough.
Instead of relying only on Automatic Emergency Braking (AEB), the car may use FSD to help steer around another vehicle.
But that doesn't mean your Tesla will simply take over whenever it detects danger.
The feature has specific activation conditions, limitations and driver-override rules.
Here's what Tesla owners need to know.
What Is Tesla Automatic Collision Evasion?
Automatic Collision Evasion expands Tesla's existing active-safety approach by allowing FSD (Supervised) to become involved during certain manual-driving situations.
Tesla first introduced the feature as part of FSD v14.3.9, alongside broader improvements to driver monitoring, vision processing and real-world driving behavior. If you want a full breakdown of everything included in the update, see our Tesla FSD 14.3.9 active safety overview.
The system can intervene in two broad situations while the driver is manually controlling the vehicle:
1. A frontal collision is imminent and braking alone may not avoid it.
2. The vehicle determines that the driver is not sufficiently attentive, or that FSD may have been unintentionally disengaged.
In either case, FSD can activate and continue driving after the intervention. (Not a Tesla App)
That's what makes this update different from a conventional emergency-braking system.
Automatic Collision Evasion vs. Automatic Emergency Braking
Automatic Emergency Braking is designed primarily around one action:
Brake.
If the vehicle detects a potential collision, AEB can automatically apply the brakes to reduce speed and potentially avoid or lessen the severity of the impact.
Automatic Collision Evasion adds another possible option:
Steer.
On a controlled-access highway, if the vehicle determines that braking in a straight line may not be enough, Tesla's new system can evaluate whether steering around the vehicle ahead offers a better path.
If the required conditions are met, the maneuver can include changing lanes or moving onto the shoulder while braking or accelerating as needed. (TeslaNorth.com)
In simplified terms:
- AEB asks: Can braking help avoid the crash?
- Automatic Collision Evasion can also ask: Is there a safer path around it?
That's a significant expansion of what active safety can attempt.
When Can Your Tesla Steer Around a Collision?
This is where the details matter.
Automatic Collision Evasion isn't designed to perform an emergency steering maneuver every time the vehicle detects a possible crash.
For the frontal-collision steering behavior described in the current release notes, several conditions need to be satisfied.
The vehicle must be on a controlled-access highway, and the threat must involve an imminent frontal collision with another vehicle where braking alone may not be sufficient.
The system must also determine that steering around the obstacle offers a better chance of avoiding the collision than straight-line emergency braking.
Current documentation reported with the rollout also places the steering intervention below approximately 85 mph (137 km/h) and excludes situations where the road is detected as wet or slippery or where pedestrians or cyclists are in the proposed path. (TeslaNorth.com)
So this isn't:
“Tesla automatically swerves around everything.”
It's a much narrower safety function operating under defined conditions.
What Might the Maneuver Actually Look Like?
Imagine you're manually driving your Tesla on the highway.
Traffic ahead suddenly stops.
The vehicle detects that a frontal collision is imminent.
AEB begins slowing the car, but the system determines that braking alone may not avoid the impact.
If another safe path is available and the required conditions are met, Automatic Collision Evasion may activate FSD and steer around the vehicle.
That could mean:
Moving into another lane
or
Moving onto the road shoulder
while adjusting braking or acceleration as necessary. (TeslaNorth.com)
After the emergency maneuver, the system is designed to continue driving rather than simply handing back control at the most chaotic moment.
That's an important part of the concept.
The goal isn't only:
Avoid the obstacle.
It's also:
Keep the vehicle under controlled guidance immediately afterward.
Can Automatic Collision Evasion Activate When FSD Is Off?
Yes — and this is probably the most important part for owners to understand.
Automatic Collision Evasion is specifically designed to operate in certain situations while you're driving manually.
That means FSD doesn't necessarily have to be actively driving the vehicle at the moment the dangerous situation develops.
Tesla describes the system as being able to activate FSD (Supervised) to try to keep the vehicle safe and then continue driving. (Not a Tesla App)
This represents a meaningful shift in how drivers may think about FSD.
Traditionally, the mental model has been:
FSD ON = FSD drives.
FSD OFF = I drive.
Automatic Collision Evasion makes that boundary less absolute.
Under specific safety conditions, FSD can become an active-safety layer operating in the background.
What If Tesla Thinks You're Not Paying Attention?
Collision avoidance isn't the only trigger.
The system can also activate if the vehicle determines that the driver is not sufficiently attentive to the road.
Tesla gives an example of a driver reaching toward the back seat.
It may also intervene if the vehicle believes FSD was unintentionally disengaged. (Not a Tesla App)
This second mode isn't necessarily responding to an imminent frontal collision.
Instead, it appears designed to prevent a dangerous situation from developing when the vehicle believes effective driver control may have been compromised.
Tesla's current release information indicates this mode can operate outside the controlled-access-highway collision scenario as well. (TeslaNorth.com)
That makes driver monitoring increasingly important to Tesla's broader safety architecture.
Can the Driver Override Automatic Collision Evasion?
Yes, but Tesla appears to have deliberately designed the override differently from a normal FSD disengagement.
According to the detailed release information accompanying the rollout, pressing the brake during a collision-evasion maneuver can slow the vehicle without immediately canceling the maneuver.
The accelerator is muted during the intervention.
To cancel the steering maneuver, the driver must make a firm, deliberate steering input — requiring more force than a typical FSD cancellation. (TeslaNorth.com)
There's a logical reason for that design.
During an emergency maneuver, an instinctive pedal input shouldn't necessarily terminate the safety system at the exact moment it's trying to avoid an obstacle.
At the same time, the driver still retains a way to deliberately override the system.
What Automatic Collision Evasion Does NOT Do
This part is just as important as what the system can do.
Based on the currently documented behavior, owners shouldn't interpret Automatic Collision Evasion as a universal autonomous crash-avoidance system.
The steering intervention described for an imminent frontal collision has important limitations.
For example, the current behavior does not mean Tesla will automatically steer around every:
-
Pedestrian
-
Cyclist
-
Head-on vehicle
-
Cross-traffic conflict
-
Roadside obstacle
-
Hazard in poor road conditions
In situations outside the defined steering conditions, Automatic Emergency Braking remains the primary active-safety response where applicable. (TeslaNorth.com)
And FSD remains explicitly Supervised.
Tesla's own description of FSD continues to require the driver to remain attentive and ready to take action. Tesla does not describe the system as making the vehicle autonomous. (Tesla)
Why Wet Roads Matter
One particularly interesting limitation is road condition.
The currently documented frontal-collision steering behavior isn't intended to perform the same evasive maneuver when the vehicle detects that the road is wet or slippery. (TeslaNorth.com)
That makes engineering sense.
Emergency steering isn't only about identifying an open space.
The vehicle also needs enough tire grip to:
Change direction
Remain stable
and potentially
Brake at the same time.
Available traction can change dramatically with rain, snow, ice, tire condition and road surface.
So even if the vision system can identify an escape path, that doesn't automatically mean the vehicle has enough physical grip to execute it safely.
It's a useful reminder that software cannot eliminate the limits of tires and road friction.
Does Automatic Collision Evasion Work on HW3 Teslas?
This is one of the biggest questions surrounding the rollout.
At the moment, Automatic Collision Evasion is associated with the HW4 version of FSD v14.3.9.
Tesla's software update 2026.27.6 is unusual because it contains two FSD branches.
Newer HW4 vehicles receive:
FSD (Supervised) v14.3.9
while HW3 vehicles are receiving:
FSD v14.2 Lite.
Not a Tesla App's current rollout tracking specifically identifies Automatic Collision Evasion with the HW4 branch. (Not a Tesla App)
So HW3 owners should not assume that receiving a newer FSD update automatically means they have the same Automatic Collision Evasion capability.
Which Tesla Models Are Getting FSD 14.3.9?
Current rollout information identifies HW4 versions of Tesla's major vehicles, including Model 3, Model Y and Cybertruck, with newer Model S and Model X configurations also represented in the release information. (Not a Tesla App)
But software rollout is gradual.
Not every eligible Tesla receives an update at the same time.
As of the current rollout data, software version 2026.27.6 remains in the early stages of deployment, so owners shouldn't assume something is wrong simply because the update hasn't appeared on their vehicle yet. (Not a Tesla App)
FSD 14.3.9 Is More Than a Collision-Avoidance Update
Automatic Collision Evasion is the headline feature, but v14.3.9 contains broader changes to the FSD stack.
Tesla's release notes say the update includes an upgraded reinforcement-learning stage and a new vision encoder aimed at improving understanding in rare and low-visibility scenarios.
Tesla also says it rewrote its AI compiler and runtime using MLIR, resulting in a claimed 20% faster reaction time.
Other changes target:
-
Emergency vehicles
-
School buses
-
Right-of-way violations
-
Small animals
-
Parking decisions
-
Lane biasing
-
Tailgating behavior
-
Traffic-sign understanding
These are Tesla's stated release-note improvements; real-world performance will depend on how the system behaves across different roads and situations. (Not a Tesla App)
What Are Early FSD 14.3.9 Testers Saying?
Now that 2026.27.6 is beginning to reach customer vehicles, early real-world impressions are starting to appear.
Drivers cited by Not a Tesla App have reported faster decision-making, smoother parking behavior and improved highway stability in early testing. (Not a Tesla App)
Those reports are useful signals, but they shouldn't be treated as controlled evidence that every driver will experience the same improvement.
And there's an even bigger limitation when evaluating Automatic Collision Evasion itself:
This isn't a feature owners should intentionally try to trigger on public roads.
A normal FSD drive can be tested repeatedly.
An emergency collision-evasion system can't responsibly be evaluated by deliberately creating a real crash scenario.
That means meaningful evidence about its effectiveness will take time.
Why This Update Matters Beyond FSD
Automatic Collision Evasion points toward something bigger than another FSD feature.
Tesla is increasingly combining two areas that were traditionally treated separately:
Driver assistance
and
Active safety.
AEB, Forward Collision Warning and Lane Departure Warning are designed primarily as safety systems.
FSD has historically been thought of as a driving system.
Automatic Collision Evasion begins to blur that distinction.
The same vision and decision-making system that can navigate an interchange may now also be used as an emergency safety layer when the human is driving.
That could ultimately be one of the more important directions for Tesla's software.
Even drivers who don't want FSD handling every commute may still value technology capable of intervening during the few seconds when something goes seriously wrong.
Should Tesla Owners Do Anything Differently?
For now, the answer is mostly no.
Automatic Collision Evasion shouldn't change the basic responsibilities of driving a Tesla.
Keep your attention on the road.
Maintain a safe following distance.
Keep your tires in good condition.
Don't intentionally test emergency safety features.
And don't assume FSD will always identify or successfully avoid a dangerous situation.
Tesla continues to classify FSD as Supervised, meaning the driver remains responsible for the vehicle and must be prepared to intervene. (Tesla)
Automatic Collision Evasion should be viewed as another safety layer — not permission to pay less attention.
Yeslak's Take
The most interesting part of FSD 14.3.9 isn't that Tesla has created another automated driving feature.
It's when Tesla is allowing that technology to become involved.
Until now, most owners thought about FSD as something they consciously turned on to let the car drive.
Automatic Collision Evasion introduces a different idea:
FSD can also act as a safety system waiting in the background while you drive.
That distinction could become increasingly important.
A future version of FSD doesn't necessarily need to replace the driver every minute to provide value.
Sometimes the most valuable intervention could be the one that happens for only a few seconds.
For Tesla owners, however, the rule hasn't changed:
The driver is still responsible.
The technology may be getting better at helping when things go wrong.
That doesn't mean we should give it more opportunities to prove it.
FAQ
What is Tesla Automatic Collision Evasion?
Automatic Collision Evasion is a new active-safety feature associated with FSD (Supervised) v14.3.9. Under specific conditions, it can activate FSD while the driver is manually driving to help avoid an imminent collision or respond when the vehicle detects insufficient driver attention. (Not a Tesla App)
Can a Tesla steer around a crash automatically?
Under certain conditions, yes. On a controlled-access highway, the system may steer around another vehicle if a frontal collision is imminent and it determines braking alone may not be sufficient. The feature has speed, road-condition and obstacle-related restrictions. (TeslaNorth.com)
Does Automatic Collision Evasion work when FSD is turned off?
It can activate while the driver is manually controlling the vehicle, provided the required conditions are met and the relevant safety/FSD features are available. (Not a Tesla App)
Can you override Tesla Automatic Collision Evasion?
Current release information says the driver can override the steering intervention with a firm, deliberate steering input. Pressing the brake can slow the vehicle without immediately canceling the evasive maneuver. (TeslaNorth.com)
Does Automatic Collision Evasion work on HW3?
The current rollout associates Automatic Collision Evasion with FSD v14.3.9 on HW4 vehicles. HW3 vehicles are receiving the separate FSD v14.2 Lite branch in software update 2026.27.6. (Not a Tesla App)
Is FSD 14.3.9 fully autonomous?
No. Tesla continues to classify FSD as Full Self-Driving (Supervised). Drivers must remain attentive and ready to intervene. (Tesla)
