"The ramifications of streets filled with self-driving cars are countless. More vehicles can occupy the road given their instantaneous response time. Fuel consumption will decline by eliminating aggressive drivers and allowing lighter vehicles to prevail. Morning commutes could come with some extra shut-eye. Drunk driving arrests and injuries will sharply decline, as will texting-related mishaps. Cars can drop passengers off at the door of a bar, then spend the next hour looking for a spot on their own. Then they could be summoned via an iPhone app like Michael Knight's wristwatch. And should the need occur, autos can be delivered from one residence to another."