M4 motorway M4 motorway The M4, a motorway in the United Kingdom running from west London to southwest Wales, was originally referred to as the London-South Wales Motorway. The English section to the Severn Bridge was constructed between 1961 and 1971; the Welsh element was completed in 1993. The Second Severn Crossing officially renamed the Prince of Wales Bridge, was inaugurated on 5 June 1996 by HRH The Prince of Wales and the M4 was rerouted. Apart from its two spursthe A48(M) and the M48the M4 is the only motorway in Wales. From London to Bristol, the M4 runs close to the
M4 motorway Usk bridge two crossings (east/westbound) were added as a connection from the M4 (at the newly constructed junction 25a) to the north/southbound A4042 Heidenheim Drive. M4 motorway Usk bridge The M4 motorway Usk bridge (or St. Julians Bridge) carries the M4 motorway across the River Usk in the city of Newport in the United Kingdom. The bridge is actually two separate bridges for the eastbound and westbound carriageways. When travelling westbound, the bridges lead directly into the twin Brynglas Tunnels. Work commenced on both the bridge and the tunnels on 10 September 1962, two months after work commenced on the George Street