Why did the expressway from Hohhot to Beijing give a pop-up window?

there are cases with confirmed epidemic situation. As of September 27, 222, according to the epidemic prevention and control policy of Hohhot municipal government, there were cases of confirmed epidemic in Hohhot, so the information of pop-up window will be reminded on the expressway to Beijing. The pop-up window cannot be lifted until the relevant epidemic risk is effectively controlled or the subsequent flow data can eliminate the associated risk. Hohhot, commonly known as Hohhot and formerly known as Guisui, is a prefecture-level city and capital of Inner Mongolia Autonomous Region, the political, economic and cultural center of Inner Mongolia Autonomous Region approved by the State Council, and an important central city in the northern border areas of China.