A30 Cornwall upgrade nears finishing line

Trevalso underpass to open by early summer
By Liam McLoughlin May 30, 2025 Read time: 2 mins
The new B3285 section from Boxheater to Carland is part of the A30 dualling scheme. Image: National Highways

The UK's National Highways says it is working towards opening the Trevalso underpass in Cornwall by early summer as part of the A30 Chiverton to Carland Cross dualling scheme.

Since opening the new dual carriageway last June, National Highways and principal contractors Costain have been continuing ancillary work through the winter and spring, including local road connections, Cornish hedging and the planting of 44,000 trees across the landscape.

The programme of work has seen the old A30 open as the B3285 and B3288 between the Chybucca and Carland junctions, and National Highways says the Trevalso underpass near Zelah is on course to be completed and opened to traffic in July.

The Trevalso underpass is anticipated to be opened by early July, with Pennycomequick Lane and the Church Lane underpass opening soon after, while the Cornish hedging work will also be completed in the summer and the planting of another 40,000 trees taking place across the scheme landscape in late autumn.

Andrew Alcorn, National Highways’ programme manager for the A30 Chiverton to Carland Cross scheme, said: “Opening the new dual carriageway has made a significant and positive difference to people’s journey times and opening up the old A30 will improve local connectivity and bring benefits to communities and residents alongside the new road.

“We’ve progressed a significant amount of ancillary work, including planting, hedging and landscaping, we’re in touching distance of the finishing line now and we thank people in advance for their continued co-operation and patience while we carry out these final works.”

The cost of developing the scheme has been funded by an £8m contribution from the European Regional Development Fund, with an additional £12m for the construction phase. The remainder of the cost of developing and delivering the scheme has been funded by central Government.

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