The Stonehenge road tunnel is a planned tunnel in Wiltshire, England, drawn up by Highways England to upgrade the A303 road. It would move the A303 into a tunnel under the Stonehenge World Heritage Site, completing the removal of traffic begun with the 2012 closure of the A344 road. The wider project was designed to improve the landscape around the monument and to improve safety on the A303, and was part of proposals to change the site in other ways including moving the visitors' centre. In 2020, the project was expected to cost £1.7 billion.