M4 Brynglas Tunnels refurbishment, Wales, UK
The Brynglas Tunnels carry the M4 motorway under Brynglas Hill in Newport, south Wales. Completed in 1967, the 370 m long, twin two-lane tunnels are the first and only bored tunnels on the British motorway network. A major NEC-procured refurbishment of the tunnels and adjacent bridge structures is currently underway to improve resilience for the foreseeable future.