The routes would typically sit above regular roads, and would be decidedly cozier thanks to covering and a cooling system driven by purified rainwater. An automatic speed limit (in the concept, about 15.5MPH) and AI-driven traffic management would prevent the faster vehicles from crashing into scooters. And you might not even need to own a machine to use it -- BMW envisions a rental system where you'd pick up a bike at an access point if you need to get across town in a hurry.
You won't necessarily see something like this in markets where cars dominate, like North America. A system like Vision E3 Way could be very useful in countries like China, however. It's not just that many more people ride bikes in these areas -- it's that high population densities could necessitate separate, automated roads to keep traffic flowing. The challenge is getting cities to take up the idea. Even if these roadways don't cost much to build, it's no mean feat to significantly alter the urban landscape.
from The Unofficial Apple Weblog (TUAW) http://my.onmedic.com/2A2ZAlZ