If a code is yellow, it means there is risk, so it affects travel. The reason is very simple, because one code is basically implemented in the whole country, so if you display your health code in other cities and open it in yellow, it will affect your normal travel work.
Introduction:
Travel is a Chinese vocabulary, and its pinyin is chū xíng, which means going out for travel, sightseeing, or the traffic behavior of vehicles and pedestrians moving from the starting point to the destination. The words "Shi Ji Tian Guan Shu": "He left for 18 days and entered 240 days." Traditional fertility customs. Three days after the child is born, it is called "going out" to choose two sunny days and be strolled on the street by his father.
Records of the Historian Tianguan Book: "He left for 18 days and entered for 240 days." "The Biography of Gongsun Zan in the Later Han Dynasty": "(Gongsun Zan) tried to ride from dozens to hundreds."
Shen Kuo's Meng Qian's Talk about Personnel and Me: Is Zhao Yuedao Chengdu? Transshipment makes you travel with only one piano and one crane, and sit and watch cranes and drums. "Feng Menglong? Chapter 18 of the History of the Eastern Zhou Dynasty: "Huan Gong is lustful, and every line must be accompanied by Miracle; Guan Zhong is following suit. "