SHANGHAI - General Motors unveiled a new electric concept car in China on Wednesday , aiming to burnish its image as a supplier of non-polluting cars tailored to the crowded mega-cities of the future. GM showcased the EN-V, or "Electric Networked-Vehicle," at a pavilion that it will share with its China joint venture partner, SAIC Motor Corp, during the World Expo to be held in Shanghai from May through October. The two-seater EN-V, which would communicate with other cars to help avoid accidents and ease traffic in congested major cities like Shanghai, is only at the conceptual stage -- it would not hit showrooms for another 10 to 20 years, and would require regulatory changes for it to be allowed on roads. But the Detroit automaker is looking to the helmet-shaped EN-V to help establish itself as a significant player in cutting-edge, fuel-efficient vehicles while it seeks to reinvent itself after emerging from bankruptcy last July. "In the EN-V we are really showing a new concept, for not just electrified vehicles but a reinvented vehicle experience for mega cities," Alan Taub, GM's vice president for global research and development, told reporters in Shanghai.