Anything is possible in lucid dreams, however I don't think you grasp the fundamentals of controlling lucid dreams. Actions in dreams have more to do with believing than knowing. In order to drive a car, you need to believe that the car will move with whatever input you give it, whether it be pushing a gas pedal or yelling commands and directions at it, rather than actually knowing the inner workings of the vehicle. Everything in your dream responds to your thoughts. Flying cars hoooo!