Traffic Light System in App

The contact tracing app should have an ID screen, with your name and photo and a red, amber or green circle. Those who have immunity - green - can go anywhere. Amber people who have not had the disease or a vaccine, should follow precautions. Anyone with symptoms or has been in contact with someone who is ill, would be red and required to self isolate. To gain entry to restaurants, theme parks etc you would show that page on your app.

To restore normality yet keep risk low.