This idea has been around since the 50's under various forms and will someday change the world as we know it. It is mostly known as Personal Rapid transit (PRT) and can be used to trasport food, waste, and all sorts of cargo including people at 1/2 of the cost of any other transport system (bikes can be cheaper). See www.personalrapidtransport.com (not a commercial site, just advocacy).
pyrhho|15 years ago