This according to Google scientist and Stanford professor Sebastian Thrun, in a speech delivered on Saturday at a conference. Thrun says that robotically driven cars would be able to communicate with each other much better and as such they could tailgate like crazy. More densely packed highway traffic could mean more efficient traffic since there would be substantially less wind drag. It's the same principle as Tour de France cyclists biking really extremely close to each other. This would mean traffic flows better and less energy is consumed. So it's perfect as long as NOTHING EVER GOES WRONG and a computer problem occurs sending all the cars slamming into each other and killing all aboard, which is probably not what the robots had planned all along.
Nice try, ROBOTS.