
A traffic police directs traffic on a road which is temporarily designated as a car-free zone during the "World Car Free Day" in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, Sept. 22, 2015. (Xinhua/Peng Zhaozhi)

A traffic police directs traffic on a road which is temporarily designated as a car-free zone during the "World Car Free Day" in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, Sept. 22, 2015. (Xinhua/Peng Zhaozhi)