Tourists view an electric car during an event to mark the National Plug In Day at the Capitol Hill, in Washington D.C., Sept. 29, 2013. The National Plug In Day is a nationwide celebration to heighten awareness of today's widespread availability of plug-in vehicles and highlight the benefits of all-electric and plug-in hybrid-electric cars, trucks, motorcycles, and more. Throughout the weekend of Sept. 28-29, 2013, events across the United States will celebrate the thrid annual National Plug In Day. (Xinhua/Fang Zhe) |