What I'd have in my car.
My favorite and probably one of the most useful technologies would be the detection of driver's mental alertness. And It isn't even far from application. This, we know to be one of the commonests causes of road traffic accidents and in countries like saudi arabia, THE most common cause. Smart phones have been offering this feature for a while now, whereby the screen turns off when a person is getting drowsy or has put the phone away. Same is the case with facial recognition softwares in cars, smart phones have been doing it for a while. Though yes it is a security system that cannot be messed with by thieves.
Yet I wouldn't want my car to do the thinking on my behalf..If it's my wife's birthday I would rather pick my flowers myself and remember to do that.