[kevkrom]

As a civil engineer who specializes in transportation systems

What do you think of the potential of raised-rail PRT systems? I know there's a regulatory issue with how closely the cars can run together, but if they can get around that, does it make such a system viable?

[Alberta's Child]

I consider that to be a very "futuristic" concept that is not likely to be feasible anytime in the near future. I'm also not sure people are going to be too happy about living in a city with a sprawling network of elevated guideways like that.

Interestingly . . . transportation systems like these have to be viewed in the context of all urban infrastructure. What you'll often find is that a city will often face other constraints long before it reaches the kind of size and density that makes some of these transportation systems feasible.