M4 motorway
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The M4, originally the London-South Wales Motorway, is a motorway in the United Kingdom running from west London to southwest Wales. The English section to the Severn Bridge was constructed between 1961 and 1971; the Welsh element was largely complete by 1980, though a non-motorway section around Briton Ferry bridge remained until 1993. On the opening of the Second Severn Crossing in 1996, the M4 was rerouted over it.
Prince of Wales Bridge looking towards Wales
M4 bridge over the River Neath (left) original A48(M) bridge (right)
The M4 around Port Talbot
Construction of electronic indicator signs for the variable speed limit scheme at junction 27 and a new concrete reservation (2010)
M48 motorway
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The M48 is a 13-mile (21 km) long motorway in Great Britain, which crosses the Severn near Chepstow, Monmouthshire, linking England with Wales via the Severn Bridge. This road used to be the M4, and as a result is anomalously numbered: as it lies to the north of the M4 and to the west of the M5, it is in the Motorway Zone 5. The M4, M48 and the A48(M) motorway are the only motorways in Wales.
The Severn Bridge (M48)
Construction near the hamlet of Ingst
M48 toll booths toll-free since 17 December 2018