What proof does Linzhou Expressway need on September 20, 2022?

24-hour or 48-hour negative nucleic acid test certificate. Expressway is a fully enclosed, full interchange, with traffic restrictions and speed restrictions. Relevant information shows that on September 20, 2022, Linzhou Xia Expressway needs 24-hour or 48-hour negative nucleic acid test certificate, and it also needs to show the health code, otherwise it can't get on and off the expressway.