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
Leica M4 The M4-2 added a hot shoe and motor drive compatibility as standard, but removed the self-timer. The M4-2 was followed in 1981 by the M4-P, which added framelines for 28 mm and 75 mm lenses. The range continued with the Leica M6 in 1984, which was essentially an M4-P with through-the-lens (TTL) light metering. The M4 finally ceased production in 1998, although Leica released a special edition with a high-magnification finder in 1998. Leica M4 The Leica M4 is a 35 mm rangefinder camera produced by Ernst Leitz GmbH. The M4 started production in November 1966, as the direct successor