Travelers are required to take expensive PCR tests to prove they are virus-free LONDON: Britain opened its borders to fully vaccinated travelers from the US and European Union on Monday as travel industry leaders urged the government to further ease restrictions and allow people to enjoy the benefits of a successful COVID-19 inoculation program. The new rules came into effect amid reports that Prime Minister Boris Johnson’s government may add a new category to Britain’s traffic light system of travel restrictions, a move industry officials say would make many people decide to stay home. As of Monday, fully vaccinated travelers from destinations on Britain’s “amber list” are allowed to enter the country without self-isolating for up to 10 days. The government is considering creating an amber watchlist to warn people about destinations that may be downgraded because of rising infection rates or the emergence of new variants. “An amber watchlist will be viewed as a massive red flag, which is likely to cause bookings to those countries on that watchlist to collapse,’’ Huw Merriman, chairman of the House of Commons’ Transport Committee, told the BBC. “In my view, we don’t need any more uncertainty, complexity or anxiety for passengers or this beleaguered sector. It just needs clarity.” British airlines and holiday companies are hoping for a late summer travel boom after the pandemic halted most international travel, slashing profits and threatening thousands of jobs. The number of passengers traveling through London’s Heathrow Airport, the UK’s busiest airport, fell 75 percent in the first half of this year. Travelers are required to take expensive PCR tests to prove they are virus-free and countries including the US still bar foreign travelers from crossing their borders. John Holland-Kaye, Heathrow’s chief executive, said the British government should allow most travelers to use cheaper lateral flow tests and work with countries like the US to ease remaining travel restrictions. This is warranted by the UK’s successful vaccination program, he said. Almost 89 percent of adults in Britain have received at least one dose of vaccine and 73 percent have been fully vaccinated. “This is a good start, we are showing that the vaccine is our passport to freedom,’’ Holland-Kaye said. “Let’s be confident in the vaccines. Tests show they work against delta and beta variants. So let’s start to show the vaccination will get us back to our lives as they used to be.”