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I say bring on the future. Looks awesome to me. Just make sure that it is fool-proof first. Gotta say, of all the companies (ever) Google is far and away the most primed to implement this. We are still a long time away from this being the norm. But, someday I think it will be, in some fashion or another.
Pros: eliminates intoxicated driving, careless accidents, blind spot accidents, accidents where you just look away for 2 seconds, etc. That is of course, if it works as advertised. Maybe we can eventually have a hybrid highway system, part automated, part human driven. Will be interesting.
Cons are the same as with any advancing technology: less hands on "connection" with the process of transport. Less improvisation. Will be rare to get in a car and go for a drive to blow off steam, or when you're bored go for a impromptu road trip to nowhere in particular. Also the age of who can be in ('drive' or 'operate') a vehicle by themselves will come up for debate again. For, as long as you can operate a computer, you should be able to reasonably operate a google driven vehicle, it would stand to reason. Makes me imagine rich(er) parents getting their 1st graders a google driven car for their birthday/Christmas gift, in the same fashion that kids get iPhones and iPads today.