Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

Is the model 3 supposed to apply the brakes automatically to avoid a Front collision?

This site may earn commission on affiliate links.
The option for me was already toggled on.., so I am not sure why it did not work. It says ot would apply the brakes to minimize the impact but it am sceptic now.
Perhaps the best thing to do in this situation is look at what the manual for the car says about the feature in question:

(link to the manual)

Relevant text:

Forward Collision Warning​

Model 3 monitors the area in front of it for the presence of an object such as a vehicle, motorcycle, bicycle, or pedestrian. If a collision is considered likely unless you take immediate corrective action, Forward Collision Warning is designed to sound a chime and highlight the vehicle in front of you in red on the touchscreen. If this happens, TAKE IMMEDIATE CORRECTIVE ACTION!
Screenshot of the detected vehicle in front of the Tesla highlighted in red
Visual, audible, and haptic feedback warnings cancel automatically when the risk of a collision has been reduced (for example, you have decelerated or stopped Model 3, or the object in front of your vehicle has moved out of your driving path).
If immediate action is not taken when Model 3 issues a Forward Collision Warning, Automatic Emergency Braking (if enabled) may automatically apply the brakes if a collision is considered imminent (see Automatic Emergency Braking).
By default, Forward Collision Warning is turned on. To turn it off or adjust its sensitivity, touch Controls > Autopilot > Forward Collision Warning. Instead of the default warning level of Medium, you can turn the warning Off, or you can choose to be warned Late or Early.
Note
Forward Collision Warning automatically resets to Medium at the beginning of each drive.
Warning
The camera(s) and sensors (if equipped) associated with Forward Collision Warning are designed to monitor an approximate area of up to 525 feet (160 meters) in your driving path. The area being monitored by Forward Collision Warning can be adversely affected by road and weather conditions. Use appropriate caution when driving.
Warning
Forward Collision Warning is designed only to provide visual and audible alerts. It does not attempt to apply the brakes or decelerate Model 3. When seeing and/or hearing a warning, it is the driver's responsibility to take immediate corrective action.
Warning
Forward Collision Warning may provide a warning in situations where the likelihood of collision may not exist. Stay alert and always pay attention to the area in front of Model 3 so you can anticipate whether any action is required.
Forward Collision Warning operates only when driving between approximately 3 mph (5 km/h) and 90 mph (150 km/h).
Warning
Forward Collision Warning does not provide a warning when the driver is already applying the brake.

Automatic Emergency Braking​

Model 3 is designed to determine the distance from a detected object traveling in front of it. When a frontal collision is considered unavoidable, Automatic Emergency Braking is designed to apply the brakes to reduce the vehicle's speed and therefore, the severity of the impact. The amount of speed that is reduced depends on many factors, including driving speed and environment.
When Automatic Emergency Braking applies the brakes, the touchscreen displays a visual warning and sounds a chime. You may also notice abrupt downward movement of the brake pedal. The brake lights turn on to alert other road users that you are slowing down.
Green letter A within a circle
Emergency braking in progress
Automatic Emergency Braking operates only when driving between approximately 3 mph (5 km/h) and 90 mph (150 km/h).
Automatic Emergency Braking does not apply the brakes, or stops applying the brakes, when:
  • You turn the steering wheel sharply.
  • You press and release the brake pedal while Automatic Emergency Braking is applying the brakes.
  • You accelerate hard while Automatic Emergency Braking is applying the brakes.
  • The vehicle, motorcycle, bicycle, or pedestrian is no longer detected ahead.
Automatic Emergency Braking is always enabled when you start Model 3. To disable it for your current drive, touch Controls > Autopilot > Automatic Emergency Braking. Even if you disable Automatic Emergency Braking, your vehicle may still apply the brakes after detecting an initial collision to reduce further impact (see Multi-Collision Braking).
Warning
It is strongly recommended that you do not disable Automatic Emergency Braking. If you disable it, Model 3 does not automatically apply the brakes in situations where a collision is considered likely.
Warning
Automatic Emergency Braking is designed to reduce the severity of an impact. It is not designed to avoid a collision.
Warning
Several factors can affect the performance of Automatic Emergency Braking, causing either no braking or inappropriate or untimely braking, such as when a vehicle is partially in the path of travel or there is road debris. It is the driver’s responsibility to drive safely and remain in control of the vehicle at all times. Never depend on Automatic Emergency Braking to avoid or reduce the impact of a collision.
Warning
Automatic Emergency Braking is designed to reduce the impact of frontal collisions only and does not function when the vehicle is in Reverse.
Warning
Automatic Emergency Braking is not a substitute for maintaining a safe traveling distance between you and the vehicle in front of you.
Warning
The brake pedal moves downward abruptly during automatic braking events. Always ensure that the brake pedal can move freely. Do not place material under or on top of the driver’s floor mat (including an additional mat) and always ensure that the driver’s floor mat is properly secured. Failure to do so can impede the ability of the brake pedal to move freely.
 
I have gone through all these runbooks already.. , but theory is one thing and practically how it got executed is another thing.. So that’s the reaaon of discussing in this forum.


Do you have any evidence it's not executed exactly as described in the manual?

This stuff is all tested by multiple government agencies in multiple countries....and Tesla consistently ranks as the safest cars in the world including on these exact items.
 
I have gone through all these runbooks already.. , but theory is one thing and practically how it got executed is another thing.. So that’s the reaaon of discussing in this forum.
Well, the fact you ARE discussing this in this forum tells us that Tesla systems worked sufficiently fine. The goal of the emergency systems like AEB is not to save your car but to save your a$$.

As far as I know, the AEB will not engage at low speed, for example.
 
Well, the fact you ARE discussing this in this forum tells us that Tesla systems worked sufficiently fine. The goal of the emergency systems like AEB is not to save your car but to save your a$$.

As far as I know, the AEB will not engage at low speed, for example.
The manual says it should apply at any speed between 3m/hr to 90 m/hr and defintely my car was at least in the 25mph ramge ..
 
The manual says it should apply at any speed between 3m/hr to 90 m/hr and defintely my car was at least in the 25mph ramge ..

People normally go down this road trying to say something like "Tesla should pay for the accident because......"

There isnt going to be a circumstance where Tesla is going to pay for this (nor should they). With that out of the way, You would need data from the car to prove that you didnt do anything that the manual states cancels AEB. You should start there (trying to get the data from tesla) vs starting here with discussing something that is impossible to prove what happened or didnt happen.
 
Also if you had a real accident you can pull data from the EDR yourself using the stuff here:

Or, since you're in Fort Mill, you're only about an hour from well known Tesla guru Jason Hughes who could pull data for you as well, almost certainly for much less than the EDR hardware would cost you.

 
I've heard the anticollision warning alarm several times now and I find it pretty loud and hard to ignore. So I slow down. I've never gotten close enough to the offending car to test the automatic braking. Did you see if the car recorded the event? Did you honk the horn? It would have recorded the crash. But if you hit the car from behind, there is normally one result.
 
As driver assistance features become more advanced there surely will come a day when cars can automatically intervene to prevent collisions. But today is not that day, hence the owner's manual language clearly stating that it is "not designed to avoid a collision."

The car will try to alert you, it may increase brake boost pressure, and it might even apply the brakes to some extent, but that's it. The rest is up to you.