Well, if we are talking about safety and possible problems with the interaction of man and car, I read this:
Cars That Can't Crash: 'Technology is Doable Right Now'
I found interesting (same source) the fact that the radio communications of the cars, even if they are ciphered, can be used to detect your car and to provide its speed and position (to NSA?): Cell Phones Automatically Monitored for Better Traffic Updates