Cars need lots of land for parking because they spend most of their time idle, because people find it cheaper to own their own car than to use taxicabs. Also,

Cars need lots of land for parking because they spend most of their time idle, because people find it cheaper to own their own car than to use taxicabs. Also, people buy the largest car they could plausibly need, unless they buy more than one. Individuals' strong identification with the car they drive further contributes to excessive size and power. Automated taxis solve the problem. They will spend much less time idle, can be parked more compactly, don't need to be parked near a destination, and can have a size distribution that matches the needs of individual trips (i.e., mostly very small.) If they're cheap enough, then they'll be widely used, and wait times will be small. Because they will be automated, they can be taken in and out of service very quickly, and there will always be about the right number available. Also, they'll be much safer for cyclists and pedestrians to share the road with, and they'll use less of the existing road space, allowing us to add and widen bike lanes throughout our cities.