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 relief road 2014 plans could jeopardise future investment in the area. Matthew Kennerley of ABP said: "We don't think it's a great idea to put the new route through the centre of Wales' most important general cargo port. We believe there is an alternative route...slightly further north...[which] would still have an impact on the port but to a much lesser extent because it would not be bisecting very important quayside areas." M4 relief road The M4 relief road is a proposed motorway south of the city of Newport, South Wales. Originally proposed in 1991, the scheme was dropped by the Welsh Government