Photo taken on April 25, 2017 shows a high-speed test track of Ford proving ground in Nanjing, capital of east China's Jiangsu Province. The test track, which is 3,036.684 meters long with designed highest speed at 160 kilometers per hour, is fully made by Chinese company and is expected to put into operation in July. China's test tracks of proving ground were once all built by foreign construction companies. (Xinhua/Li Xiang)
