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, ...
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, ...