title: Southwick Hill Tunnel
text: # Southwick Hill Tunnel
  
  50°51′17″N 0°14′19″W﻿ / ﻿50.85472°N 0.23861°W﻿ / 50.85472; -0.23861
  
  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
  
  The tunnel was built through the Newhaven Chalk layer using the New Austrian Tunnelling method. The structure uses shotcrete and untensioned bolts.
  
  