Toyota plans this fall to unveil a car that parks itself. Journalists who have test-driven the car report it works. “Self-driving systems have been in research laboratories for years. Automotive experts expect the car to make splashy headlines when Toyota officially unveils it to the public next month. It will initially be offered as a high-end feature for the $20,000 Prius, a model that uses an electric motor to assist a gasoline engine to conserve fuel.”