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 (Copenhagen) M4 (Copenhagen) The M4 (the Harbour Line) is a future expansion of the Copenhagen Metro connecting Nordhavn in the north with Sydhavn in the south. The northern arm was approved by the Danish Parliament in 2012 and is expected to open in 2019, while the southern arm was approved in 2015 and is expected to open in 2023. Both Nordhavn and Sydhavn are former industrial areas situated at opposite ends of the Port of Copenhagen and currently undergoing urban renewal under the auspices of By & Havn. The M4 Line will serve 13 stations. From København H to Østerport the