M4 motorway not signed, European route E30 includes most of the M4. The M4 has two sections of smart motorway. The one between junctions 19 (M32) and 20 (M5) north of Bristol has variable speed limits and a part-time hard-shoulder. Completion was in summer 2014. The section between junctions 24 and 29 in Newport has variable speed limits. In 2010 it was announced that a smart motorway would be constructed between junctions 3 and 12, with work starting in Autumn 2018. This will be the longest smart motorway scheme in the United Kingdom, with a length of 51km (32 miles). Work is
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