What is the traffic light system? The future of travel for English and Welsh residents all hangs on the traffic light system – a new system that will introduce a green, amber and red list of countries, with each colour meaning different rules around testing and quarantining. AdvertisementMany had speculated on what the traffic light system would look like, although these predictions varied. Read next Red list countries: Which destinations are on the travel ban list Coronavirus travel advice Red list countries: Which destinations are on the travel ban listCountries with low cases and deaths, high vaccination rates and low numbers of ‘variants of concern’ have been given the green light. AdvertisementWill the traffic light countries change?