A waitress wearing a face mask serves a table at a restaurant in Vienna, Austria, on Sept. 5, 2020. The COVID-19 "traffic light" system has officially started operation in Austria, the government announced on Friday. Due to the consistently high number of new infections, Austria's three large cities -- Vienna, Linz and Graz -- as well as the Tyrolean district of Kufstein light up in "yellow" (medium risk), while the rest of the country is designated "green" (low risk), according to a press conference held by Chancellor Sebastian Kurz and other government officials. (Photo by Georges Schneider/Xinhua)
