the main road through the gorge until the construction of a road on a new alignment in the 1960s.

Heads of the Valleys Road

:See main article on A465 roadThe A465 was dualled through the gorge between 2013 and 2021. The previous alignment of this major trunk road through the gorge was constructed in the 1960s by John Morgan (Construction) Ltd of Cardiff. Achieving a consistent gradient of 1 in 20 for a distance of 4 km it climbs 210 m from Gilwern to

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