What looks like a giant helmet, can potentially zip through congested city streets, has eco-friendly bona fides, and can "talk" with other vehicles on the road? It's the new 2-person EN-V, an "Electric Networked Vehicle" from GM--a concept car that the company hopes will change the way people in crowded cities drive in the future. GM unveiled several models of the helmet-shaped concept vehicle in Shanghai. The 2-wheeled vehicles, built in collaboration with Segway and GM's Chinese partner S.A.I.C., are powered by electric motors and can travel up to 25 miles on a single charge.