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
M32 Tank Recovery Vehicle tracks which gave the vehicle insufficient flotation to move over poor terrain such as mud and the power of the engine was insufficient to pull large tanks, such as the M26 Pershing. Some M32B1s were also shipped to Britain under Lend-Lease, where they were designated the ARV Mark III by the British Army. The Ordnance Department attempted to replace the M32 with the T12 Armored Recovery Vehicle in 1944 in M26 Pershing companies, but the T12 became too expensive, and so was never put on the production line. The M32 was also planned to have mine-exploding equipment, such as the