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A465 Heads of the Valleys Sections 5 & 6

  • Project Type Roads / Bridges
  • Client Welsh Government
  • Company Involvement FCC Construction was awarded the contract to Design and Build the project. The Earthworks and Drainage packages of works was sub-contracted to Roadbridge from FCC Construction. FCC, Roadbridge and Tarmac were awarded the contract to operate the road for a period of 30 years.
  • Form of Contract NEC 4 – Option B
  • Dates September 2020– May 2025
  • Location Merthyr Tydfill, Wales


The Heads of the Valleys Highways Improvements Scheme, Section5 and 6 extended from Hirwaun in the west to Dowlais Top in the east, passing to the north of Merthyr Tydfil. The length of the scheme was 17.7km. The scheme was predominately an on-line improvement of the existing A465 trunk road. Six junctions were provided within the scheme, all of which were grade separated. The junctions included Hirwaun, Croesbychan, Baverstock, A470, Prince Charles Hospital and Dowlais.


Key Features

  • 2,277,388m3 of earthworks including 1,023,519m3of cohesive material, 555,464m3 of rock, 366,691m3 of unsuitable and 331,714m3 of Topsoil.
  • 7 no overbridges, 5 no viaducts, 11 no underbridges, 5 no underpasses, 23 no retaining walls, 1 no railway bridge, 3 no pedestrian bridges and 1 Gas Protection slab
  • 12 roundabouts
  • Works completed within mine and karst ground conditions
  • Operation and maintenance of the project road for 30 years.