Overnight closures on A30 from tonight
National Highways is working towards opening the Trevalso underpass in early summer
Last updated 8th Jun 2025
National Highways is working towards opening the Trevalso underpass in early summer, further improving local connectivity 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 the Trevalso underpass near Zelah is on course to be completed and opened to traffic in July.
Following resurfacing and road marking work around the Chiverton gyratory this month and the completion of footpath work at Chybucca, further finishing work will be carried out under four weeks of overnight closures of the A30 from next week.
Final resurfacing work at the Carland junction will take place under a week of overnight closures (8pm to 6am) from Monday, 9 June, under weeknight closures of the A30 between Mitchell and the Chiverton interchange, along with a closure of the A39 and B3285 roads.
During the work, new, permanent signage will be installed, along with the completion of footpaths and road marking.
Phased finishing works, including signage installation and drainage, will also be carried out under three weeks of overnight weeknight closures (8pm-6am) from Monday, 16 June 16.
Varying and clearly signed diversion routes will be in place to enable the works, latest information is available on the scheme web page, updates are also available on the X (formerly Twitter) feed at @HighwaysSWEST and for urgent real-time assistance, the company’s 24/7 contact centre team is able to provide up-to-the minute information on 0300 123 5000.
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 project team is continuing to work closely with Cornwall Council and other key local stakeholders and is keeping local communities fully informed as the scheme approaches completion.