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
M4 Western Motorway entire motorway was allocated the M4 route. The non-motorway section of Metroad 4 was however replaced by A4. The eastern end of the M4 is currently at North Strathfield, some from the Sydney central business district. Over the years a number of proposals have been made to extend the M4 east towards the city. One plan in the 1990s involved extending the M4 eastwards by approximately so that it would subsequently end in Ashfield and be continuous with the City West Link. Further planned upgrades to the City West Link would mean commuters going west out of the city could