Why is this slope so slippery?

Autoweek point out that many cars in the 'States have "black boxes" (more correctly called EDRs, Event Data Recorders) that can record information about crashes but that also collect information like current revs, wheel slip angle and more.

You need not be anywhere close to a collision, really. For our road test team this summer, it was just a matter of running a routine slalom in a Chevy Malibu Maxx—without so much as hitting a rubber cone—when OnStar called to check up on our driver’s health.

If you’re anything like us, it won’t be until after you’ve explained to the distant helper that you didn’t have an accident, the airbags did not deploy, and you don’t need assistance, that you’ll begin to experience an uneasy feeling in the pit of your stomach.

How’d they know that you were driving like that? What else do they know? And who else knows?

I'm no raging civil libertarian, but the thought of my car's manufacturer or service-person being able to deduce my driving habits and (eventually) previous locations is a bit scary. On the plus side, having automatic notification of someone, anyone, in the case of an accident would be something I would love to see in a car, particularly one my wife was driving.

Really, this would seem to be another case of a technology being implemented in a postive way, without any thought, so it would seem, for the values that such a technology brings with it, and then being able to be used for slightly more sinister or at least priviacy-invading purposes.