In general, the health code will only be recognized as a spatio-temporal companion if it stays in the middle and high risk area for more than 4 hours, and the spatio-temporal companion is in the same spatio-temporal grid as the confirmed patient within 14 days, usually taking 800 meters by 800 meters as the detection range, and the * * * stay time exceeds 10 minute. If you just pass by by by car and stop for a short time, the health code will not change color, and the health code will not collect personal location information, but the travel code will remind you that you have been to the middle and high risk area. Your travel itinerary code may not change color after arriving in other regions across provinces. It took you more than four hours to show travel itinerary after you left the province and arrived in other areas. If you go to a low-risk area, your travel itinerary code will not change color or stay green. If the area you are going to is the control area of the middle and high risk area. If you stay for more than four hours, it will turn yellow or red. Generally speaking, the trip code is still green with an asterisk below it.