Generally speaking: you don't need to look up any travel code, all the information is available, and you can find it right away if there is anything. This is called big data. However, there are also related hot spots: at the entrances and exits of expressways, epidemic prevention and control staff are on duty 24 hours a day, focusing on checking foreign vehicles, checking the health codes and boarding codes of drivers and passengers, and carrying out body temperature monitoring and information registration to ensure that no one is missing from the investigation.