Combo photo shows Chen Tingxian guiding traffic at the intersection of Hongling Road and Shennan Road in 1995 (up) and Chen posing for a photo at the intersection of Hongling Road and Shennan Road on Aug. 11, 2020 (bottom, photo taken by Mao Siqian) in Shenzhen, south China's Guangdong Province. In 1986, 18-year-old Chen Tingxian came to join the army in Shenzhen from Yingde City of Guangdong Province. In 1993, he became a traffic police. During his 27 years' career as traffic police, Chen worked in many parts of Shenzhen and witnessed the development of Shenzhen. When China established the Shenzhen Special Economic Zone in 1980, its population was less than 30,000. Forty years later, it has developed into the biggest immigrant city in China housing 13 million with its GDP hitting 2.69 trillion yuan (about 389.4 billion U.S. dollars). (Xinhua)