Southwick Hill Tunnel
50°51′17″N 0°14′19″W / 50.85472°N 0.23861°W
The Southwick Hill Tunnel is a 490-metre twin-bore road tunnel to the north of Southwick, England.
The tunnel was opened in early 1996 as part of the A27 Brighton bypass and carries the road under Southwick Hill. The border between West Sussex and the unitary authority of Brighton and Hove is close to the eastern entrance of the tunnel. Non-motorised traffic (e.g. pedestrians, cyclists) and mopeds under 50 cc are prohibited from using the tunnel, with a warning sign indicating an alternative route.
Engineering
[edit]The tunnel was built through the Newhaven Chalk layer using the New Austrian Tunnelling method.[1] The structure uses shotcrete and untensioned bolts.[2]
See also
[edit]References
[edit]- ^ House of Commons Hansard Debates
- ^ Andrew Bowden (2013). "Geological controls on tunnelling in the chalk of Southwick Hill, Brighton". Lyell Collection. Retrieved 5 October 2024.
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