Are you kidding me? One of the several times autopilot tried to kill me was when it randomly tried to flat stop on I-80 with a semi driver following me. No way he could have stopped in time if I hadn't disengaged and slammed on the accelerator.
(Absolutely no reason to stop and no weather or afternoon sun for confusion. My best guess is that flaky vision systems thought a semi truck was entering my lane, but I really don't know.)