Megan McArdle looks at the incidents of sudden acceleration in Toyota vehicles. And the evidence is very murky. Many cases involve people 55 and older, and many involve parking or starting from a standing stop.

At any rate, when you look at these incidents all together, it's pretty clear why Toyota didn't investigate this "overwhelming evidence" of a problem:  they look a lot like typical cases of driver error.  I don't know that all of them are.  But I do know that however advanced Toyota's electronics are, they're not yet clever enough to be able to pick on senior citizens.