Cars are not a system. You need roads, traffic lights, drivers and pedestrians that respect rules, not too many holy cows in the way, not too much CO2 in your

Cars are not a system. You need roads, traffic lights, drivers and pedestrians that respect rules, not too many holy cows in the way, not too much CO2 in your quasi-self-sustaining spaceship, lungs and livers that can deal with the soot, a tolerance for high-velocity impacts risks, not too many other cars around, ...