Well, unless it's bitterly cold and you're truly stuck (ie not moving) for a long time, traffic will actually help as your energy use will go down. ...
Garage 1 at Sonoma has a NEMA 6-50 but that is the only publicly accessible (and you typically have to pay to rent a garage for the day) high voltage...
Just think about using your arm to turn a crank generator radio, flashlight, etc. You are taking energy from your muscles and spinning a motor (motor...