I could argue it from either side.... road signs, stop lights, lane markers etc all communicating to a vehicle can be nothing but positive.
But ya on the vehicle communicating back, i can see a lot of issues with that.
As far as people being worried insurance companies are spying on them because they are driving like crap. Well, as much as im against companies spying on you, i consider that a good thing. Most people think they are great drivers, almost everyone thinks they can drive MUCH better then they actually can. The truth is people suck at driving, and the massive body count each year is a perfect indicator of that. Remember if everyone is tracked then it will be the bad drivers getting charged more for instance, which is a good thing for safe drivers. You(reader) think you are a safe driver right....which means your premiums will go down once the bad drivers are found out.
What im more worried about is tracking ones movements, not how you drive, but where you drive. As a privacy advocate, i want that data to NOT be tracked.
My car receiving a signal that a car is on its right is fine, my car transmitting a signal that im a car moving at such and such speed etc is fine. My car transmitting a unique ID along with that data is NOT fine, because then everything i do is tracked. Regardless of what laws are on the books to say i wont be tracked, you know damn well you will be tracked. If nothing else you will be tracked by billboards, ad agencies etc. Unfortunately you know that a unique id along with that data will be mandatory....so there will be lots of potential for abuse.
I just hope that all v2v communications are treated as hostile data. And are only used as a confirmation for on board sensors. The potential for abuse is high if they don't start from the standpoint that all incomming data is suspect.