You don't need SkyTran in dense city centers; it can't handle the volume of people that a subway can. SkyTran is an alternative for cars; it can handle a lot m

You don't need SkyTran in dense city centers; it can't handle the volume of people that a subway can. SkyTran is an alternative for cars; it can handle a lot more people than cars, and in a far more efficient manner. It's not meant for extremely dense areas, except perhaps as an alternative to taxis (i.e., in places like London or Manhattan, it would have to more expensive than the subways and cater to richer people). The main use-case for SkyTran is for suburbs, inter-city transport (between cities close enough to drive), etc.