I switched from a 2017 to a 2021 and the ACC has been refined enough that it's notably better, though still not great. It works, and I use it often. The throttle operation is smoother, lane change indications "break" deceleration while passing a slower vehicle, and the camera has fewer disconnects.
However the systems distance estimation continues to be imperfect and I find little difference when adjusting the "follow behind distance."
It's definitely not radar based.
I don't know how BMW's steering wheel sensor works because we don't have that option in the US, but my understanding is it's part of the Traffic Jam Assist and only steers at low speeds when following another car, typically in stop-and-go traffic.
Vary rarely have I experienced a phantom braking event. These are more likely to occur in non ACC situations approaching a stop and the car slams on the brakes approaching the car stopped ahead (too quickly?). I've never had a "slam on the brakes" event under ACC, just modest braking. More often though, it just disconnects and gives me a moment to respond.
Last edited by eNate
on Thu Nov 25, 2021 4:13 pm, edited 1 time in total.
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