Hindhead Tunnel

27th July 2011. The Hindhead Tunnel is a road tunnel that opened (southbound only) on 27th July 2011, four days ahead of schedule, as part of the new Hindhead bypass for the A3 road in Surrey. The northbound tunnel will open on 29th July. It forms part of the 4-mile dual-carriageway being built to replace the last remaining stretch of single-carriageway on the 68-mile London to Portsmouth road. The bypass is intended to improve road safety, reduce congestion and improve air quality. At 1.14 miles long, the tunnel is the longest non-estuarial road tunnel in the United Kingdom, and takes the road beneath the Devil's Punch Bowl, a Site of Special Scientific Interest.