Highways England has published plans for a new two-mile-long tunnel that aims “to remove the A303 and its traffic from a large part of the Stonehenge landscape”.
The tunnel was first announced in September 2017, but full details of the proposed scheme have now been announced. If approved, the four-year construction of the 1.8-mile tunnel will begin in 2021 at a projected cost of £1.6 billion.
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The four-lane tunnel would be situated 100 meters south of the current site of the A303 by Stonehenge, bookended by a new eight-mile, dual-carriageway bypass built between Amesbury and Berwick Down.
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The proposals include the construction of ‘green bridges’ that would “connect existing habitats and allow
 the movement of wildlife”, while the tunnel itself could feature appealing ventilation outlets. A 210-metre viaduct running over the river Till to the west of Stonehenge would also be built, along with a series of new junctions, roundabouts and cuttings.
Highways England faces a series of challenges in solving the traffic problems posed by A303 at Stonehenge, which sees around 30,000 cars a day snake along a single carriageway just 165 metres from one of the world’s best-known traveler attractions.
Those pressures should be balanced against historical interests, though, as 350 burial mounds and as-yet unearthed archeological discoveries are said to lie within the 6,500 acre world heritage Site.