Cars run into a rainbow-like tunnel near an intersection of Zhengzhou-Kaifeng highway and S223 provincial road in central China's Henan Province, Oct. 13, 2015. More than 80 U-shape box girders in 12 gradients colors are installed on both ends of the tunnel. The rainbow-like tunnel could relieve the visual fatigue of drivers. (Xinhua/Zhu Xiang)
