[urbanfan89]

Maybe at Disneyland, but not in the real world.

1. Air space would be taken over, preventing construction of high rises.
2. Unable to branch out.
3. Would require tall buildings just for stations, so costs approach those for elevated rail.
4. NIMBYs would object to the lost privacy (since no one likes to see people floating outside the apartment window).
5. It's proprietary technology: once you build it you're stuck with the same company that's free to raise prices.
6. Capacity: if each car carries 10 and a car comes every 30 seconds, capacity is 1200 pphd, lower than an average bus.