Stonehenge road tunnel Stonehenge road tunnel 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 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. The A303 primary route is one of the main routes from London to
Stonehenge atop mounds. The mounds are known as "barrows" although they do not contain burials. Stonehenge Avenue, a parallel pair of ditches and banks leading to the River Avon, was also added. Two ditches similar to Heelstone Ditch circling the Heelstone (which was by then reduced to a single monolith) were later dug around the Station Stones. During the next major phase of activity, 30 enormous Oligocene-Miocene sarsen stones "(shown grey on the plan)" were brought to the site. They may have come from a quarry around north of Stonehenge on the Marlborough Downs, or they may have been collected from