BBC News Published image captionPortugal is one of just four European countries on the green list describing the announcement as "overly cautious". The traffic light system means travel abroad from 17 May will not be illegal. The 12 green list countries, which include Portugal, Gibraltar and Israel, will not require people to quarantine on return to England. Firms said leaving the US off the list would risk the UK "falling behind". Travel to amber or red lists countries is not advised. The change in travel rules applies to England, Scotland, Wales and Northern Ireland have not said when they might ease their strict travel rules.