The A48 is an Anglo-Welsh major trunk road. It runs from the A40 at Highnam (3 miles west of Gloucester) to the A40 at Carmarthen. Before the construction of the M4 motorway and the first Severn bridge in the mid 1960s it was the principal route into south Wales. For most of its journey through Wales, it runs almost parallel to its successor. Before the construction of the Second Severn Crossing, during times of high winds at the Severn Bridge the A48 was used as part of the diversion route, and is still marked as a Holiday Route.
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