A series of closures are planned along the A30 between Chiverton Cross and Carland Cross as part of a rush to complete the £330m dualling work ahead of the summer.
While the dual carriageway opened in June last year ancillary work along the 8.7 mile (14km) stretch of road is continuing and is expected to be completed by this June.
As part of the work, intersections need to be finished including road markings, signage and planting. Work is also progressing on tunnels and a green bridge at Marazanvose - the seventh of its kind in England - which will be formed with two decks and will include a footpath and a bridleway for horse riders.
National Highways and contractor Costain will be carrying out moving lane closures to finish off some of the work at the various intersections. Some of the work will also involve de-trunking the the old A30 and turning into the B3288 / B3285 when it will be handed over to Cornwall Council to manage.
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National Highways is only responsible for the A30 and A38 in Cornwall while the local authority looks after all the other roads. Along the old A30, Henver Lane to Boxheater is due to re-open in mid-February. Chybucca to Henver Lane will open at the end of February.
Full closure will be in place between Carland Cross and Boxheater during March. It is due to Meanwhile the Trevalso Lane underbridge is due to open at the end of February while there are discussions with Cornwall Council on when to open the Church Lane underpass.
The work will include Multi Species Crossing trench dig and backfill on the B3288 at Treworrian Manor with diversions via Newquay and Goonhavern then down B3285 to Henver Lane. It is expected to reopen fully for Easter weekend.
The Boxheater to Carland Cross B3288 will be closed at night from Monday, April 21, to Monday, May 5. Work on Carland Cross South Roundabout is expected to start on February 3 at night.
Marazanvose green bridge and the Tolgroggan overbridge are both scheduled to be completed and open in Spring 2025. The Pennycomequick underbridge is due to open at the latest in May.
On its website National Highways said: "Since the new A30 dual carriageway opened in June 2024 we've been working to complete and reopen the old A30 (as the B3288 / B3285) and other local roads.
"We expect to reopen the old A30 as the B3288 between Chybucca and Boxheater (near Zelah) in mid to late February 2025. To do this, we'll extend the existing closure of the old A30 (B3288) to Boxheater from Monday 13 January for four weeks. This will allow us to join up the sections of road.
"During this time, we'll divert local traffic using the old A30 along Henver Lane to join the B3285. We'll provide 24/7 access for residents inside the closure by a manned gate. We expect to complete the rest of the local work Spring 2025."
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