I think it's kept in some kind of standby mode at low speeds then kicks in automatically when over a certain speed, when IT chooses to kick in and can take the driver by surprise, the car tries to move to the centre of the lane (or what it thinks is the lane).
The conclusion: The systems are getting better.
There is no claim that they are creating safer roads, or are a net benefit.
I also got a dashcam, but all things being equal my preference would be to not hit anything in the first place.
That should always be the case, even without AEB.
Multiple times they attempted to steer me back into the oncoming vehicle because it thought I was too close to the edge. You can disable it but only for the current trip; so every time we got back in we had to go through a 2-3 minute checklist of disabling the murder settings.
IMO, all the vehicle's other convenience electronics are no-gos too. The lane keeping sensors trigger randomly and uselessly. Clearly the camera is unable to find the lane markers reliably. I turned off the service after less than a week of ownership.
The auto-high-beams work poorly, often leaving the highs lit even though headlights are clearly approaching. So I have to remain constantly vigilant that I don't annoy others, AND that it hasn't turned itself back on automatically.
Even the turn signals can't be stopped easily. Neither pulling on the stalk nor cross-signalling will stop the blinking once it starts. Cancellation seems to require about 8 additional blinks before it finally does stop, leaving me wondering which of my actions actually worked. After 5 years of ownership, I still don't know what the right magic incantation is for something that should be dead simple.
What's the point of e-conveniences that are inconvenient?
LKA is practically never strong enough itself to overpower an actual driver and force the car to swerve especially if the driver had even a reasonable grip on the wheel.
If the nudge of LKA was enough to startle the driver and have them swerve then just normal road feedback into the wheel would also cause them to startle and swerve.
Try not tailgating. Try not switching lanes when it's close. Your car will stop beeping at you, and you'll also save yourself a lot of money in the long run.