Countries that share high vaccination rates with the UK will likely be top destinations for travelers come summer Vaccination rates will play a key role in the designation of countries LONDON: UK citizens could travel abroad this summer to destinations such as Bahrain using a “traffic-light system,” government sources have suggested. Countries that share high vaccination rates with the UK — including Bahrain, Israel, Malta and the US — will likely be top destinations for travelers come summer. UK Prime Minister Boris Johnson is expected to reveal the strategy on Monday. The system will likely include three tiers, with travelers from “green” destinations becoming exempt from quarantine, while those visiting “amber” or “red” countries will face stricter conditions. Vaccination rates will play a key role in the designation of countries, but only a small number of destinations are expected to be listed as “green.”