WARNING: crash risk ACC radar cruise control

[fatjoez]

Noticed in MK2 Tiguan but probably same for all ACC radar cruise Vw

Summary:
When changing lane from one with car in front to empty, ACC accelerates the car dangerously fast and does not detect car 50metres ahead stopped in lane.

Driver must force the brakes and disengage ACC to avoid crash.


Example:
ACC radar cruise control on
Highway driving approx 80km/h
Exit highway which has multilanes at exit
Car in front slows down
ACC detects and slows down

Driver (you) change to a lane which is clear for another 50metres before car stopped at traffic light

ACC sees clear lane & accelerates aggressively to reach set speed.

ACC does not respond to stopped car just 50metres ahead and keeps driving at set speed.

Driver forced to manually break when 15-20metres away to avoid crash.


I have now confirmed this behaviour about 10 times in different situations.

The pattern is the same every time.
When car is slowed down from set ACC speed, changing to lane which is clear but has slow or stopped car further ahead - ACC no longer detects or responds to 2nd car and will crash without driver.

This is extremely strange.
Definitely software error.

Has anyone else seen this?
Is there a software update?

Edit: exact same problem experienced by other drivers here
https://www.tiguanforums.co.uk/threads/possible-major-acc-bug.2546/