Every year, more people worldwide flock to cities, where congestion and pollution are becoming intolerable. GM and Segway have teamed up to build what they believe is the solution: a two-seat, two-wheeled Segway with zero emissions. These images represent the skeletal prototype, developed under a project dubbed PUMA (Personal Urban Mobility and Accessibility), which will go into pre-production this fall. The companies expect the yet-unnamed urban transporter to get its finalized look-and-feel by early next year, meaning sales could start as soon as 2010--and because the 700-pound vehicle will require 80% fewer materials than the average car, it stands to reason it could be about 80% cheaper than a car, too.