National Highways trials low-carbon construction techniques on M5 resurfacing project

National Highways is testing a range of low-carbon construction methods and materials as part of a major resurfacing scheme on the M5 in Somerset, as the organisation looks to reduce the environmental impact of highway maintenance.

The work, taking place on the Huntworth Viaduct near Bridgwater, will build on lessons learned from previous low-carbon resurfacing projects delivered on sections of the M5 and M4 during the past year.

Working alongside contractor FM Conway, National Highways will introduce innovative materials, electric construction equipment and alternative working practices designed to lower carbon emissions while maintaining long-term road performance.

A key feature of the scheme is the use of a specially modified binder within the road surface. The material is intended to improve durability and extend the lifespan of the carriageway, reducing the need for future maintenance interventions and the associated carbon footprint.

The project will also utilise a range of electric-powered equipment, including paving machinery, sprayers, low-loaders and welfare facilities, reducing reliance on traditional diesel-powered plant.

National Highways says the initiative forms part of its wider strategy to decarbonise road construction and maintenance activities across the strategic road network.

Work will be carried out in phases, beginning with overnight southbound closures between junction 24 at Bridgwater and junction 25 at Taunton. These restrictions, which also include the junction 24 entry slip road, are scheduled to run until mid-July.

Additional overnight closures are planned later in the summer to allow resurfacing, road marking and stud replacement works to be completed safely.

The Huntworth Viaduct scheme is one of several major investments currently being delivered on the M5 across the South West. Other projects include bridge strengthening works near junction 21, resurfacing programmes in Gloucestershire and Devon, drainage improvements near junction 26, and ongoing safety barrier renewals.

Steve Aldridge, National Highways Project Manager, said:

“We’re changing the way we work to decarbonise construction on our roads, a crucial challenge of helping the UK to thrive as a low carbon economy.

“Together with our supply chain partners we’re taking positive steps towards a more sustainable future and projects like this in the South West will result in significant carbon savings, improved roads for drivers, and quieter roadworks for our neighbours.”

The trial reflects a growing focus across the highways sector on reducing embodied carbon in infrastructure projects while maintaining the performance and resilience of the road network. If successful, the techniques could help inform future maintenance schemes across the country.