HumanCar is the self-funded brainchild of Charles Samuel Greenwood, an engineer who has been working on developing the perfect human-powered vehicle since the late 1960s. Now, it looks like his car is actually getting somewhere. According to Autoblog Green, the lightweight Imagine PS is street legal and, if four people are cranking inside, can run on human power alone. "PS" stands for "power station," naturally. Based in Eugene, Ore., HumanCar Inc. is preparing to start producing the car.