As long as the green code, do not worry, very normal behavior. Even if you've traveled to 10 cities it's not a problem. The trip code represents that you've been to those places within 14 days, so as long as it's not an epidemic, there's no need to be afraid. The trip code is a manifestation of big data, if you and the positive patients have crossed the road, then the big data will find you, timely isolation, to reduce the spread, in favor of the control of the epidemic.