When I was first reading about AP lane change before it was available I thought it is pretty useless since one has to use the turn signal anyway, so hands are at the wheel and no big deal to just change the lane manually. A parking sensor malfunction resulted in auto park and lane change disabled. With this experience I now believe that AP lane change is pretty much a must have! The problem is that if one does it manually, it would be best to first disengage autopilot because any forcing of the wheel to overcome AP results in a nasty yank and unstable lane changing. So I am very glad I have this back after my sensor problem was fixed. I am wondering, how to the other driver assist cars who do not have lane change do this ?