We already have an existing red list, but both the amber and green lists have yet to be revealed. What does it mean if a country is on the amber list? The traffic light system will introduce a green, amber and possibly updated red list of countries, with each colour signifying different rules around testing and quarantining. Istanbul, Turkey Getty ImagesAdvertisementWhich countries will be on the amber list for travel? ‘Yes, you'll want to check what the situation is in two or three weeks' time when that list – the green, amber, red – is produced.