The Brynglas Tunnels carry the M4 motorway under Brynglas Hill in Newport South Wales. The 1200-foot-long (370 m) twin-bored tunnels were the first tunnels in the British motorway network and are still the only bored tunnels.The tunnels and adjacent M4 motorway Usk bridge were originally planned by Newport Corporation in August 1959 in a plan submitted to the Ministry of Transport.
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