News on M4 J3-12 smart motorway

Work to deliver 32 miles of new smart motorway started a year ago and activity is now underway all along the route including preparatory work on structures and verges, installation of new technology and construction work on the carriageway. We are making excellent progress on the western section between junctions 8/9 to 12 and have recently started work on the eastern part of the scheme with the first bridge replacements starting in the autumn. From Spring 2022, the completed smart motorway will increase capacity, reduce congestion and deliver more reliable journeys.

Read our Summer 2019 newsletter here.

There are major milestones ahead this Autumn with the start of main work to replace several bridges getting underway. There will be closures of the M4 in late September, and mid and late November to allow for the demolition and construction of bridges between junctions 8/9 and 5 with more to come in 2020 and 2021. Read more about these in the newsletter.