Annonymous 
2016 BMW 7 Series Sedan 740i 4dr Sedan (3.0L 6cyl Turbo 8A)
Adaptive Cruise Control issues with 2016 BMW 740i
 The adaptive cruise control misses to adapt speed or stop or detect a vehicle in front requiring driver intervention to avoid a collision. I have seen multiple symptoms of this problem occurring. The problems seem to be more persistent when ACC is turned on with no car in viewSymptom 1: Vehicle BMW with adaptive cruise control is tracking another vehicle (showing in cockpit) and adapting speed however for unknown reason it later fails to start the process of slowing down and collision alarm is soundedSymptom 2: Vehicle BMW is tracking another vehicle and adapting speed on lane 1; upon BMW switching lanes to another clear lane, car tracked in cockpit disappears, the BMW accelerates to reach target speed and though it later it detects another vehicle in front it fails to start slowing down. Driver intervention is required to brake and slow down.Symptom 3: Same as driving condition in symptom 2 except that upon lane switch the BMW fails completely to detect a vehicle parked in the second lane and keeps going on at same speed. Driver intervention is required to stop the BMWSymptom 4: When two lanes merge and another vehicle is moving in from the of the BMW either from the front right or the front left the BMW fails to detect the vehicle merging in front and fails to adapt speed. Driver intervention is required.