Earlier quoted context omitted.
I drove behind one yesterday as it returned to Google HQ in Mountain View. It was pretty exciting. It was also rush hour, and people didn't like that it tried so hard to give a safe amount of space in front and behind itself - it ended up being a little bubble of lane-changing space that moved slower than the rest of traffic. Not that I hold any of this against the car - it was clearly doing the intelligent thing. Bu…
Most people stay way too close to the car in front, though. You're doing well as long as nothing unexpected happens. But if someone for some reason has to hit the brake really fast, you'll get a completely unnecessary pileup. The Google cars probably also have additional margins of safety to allow for the driver to react to unexpected computer behavior _and_ actually step in and perform the maneuver himself.
> Most people stay way too close to the car in front, though.
Yes, and people who don't care about this risk are very annoying drivers for the people who do.