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 Thames Bridge the Dorney side of the Thames. M4 Thames Bridge The M4 Thames Bridge Maidenhead is a motorway bridge between Dorney Reach, Buckinghamshire and Bray near Maidenhead, Berkshire in England built in the 1960s. The bridge carries the M4 Motorway across the River Thames, on the reach above Boveney Lock, and about 500 yards short of Bray Lock. It is one of three bridges carrying motorway traffic across the Thames, the others being the M25 Runnymede Bridge (just below Bell Weir Lock) and the M3 Chertsey Bridge. There is also a pedestrian walkway on either side of the bridge, which allows