Driverless cars should have a fairly easy time getting the green light to operate on U.S. roadways, as long as they look and act like the vehicles people have been driving for the past century. Take away the steering wheel and brake pedal—as Google hopes to do from its self-driving car—and that vehicle is no longer street legal and probably would not be for some time, according to a new report from the U.S. Department of Transportation (DoT).