A flyover at the new Chiverton interchange will be partially opened to traffic next month as part of National Highways' A30 Chiverton to Carland Cross dualling scheme.

Following the early summer removal of the old Chiverton roundabout – Cornwall's worst accident hot-spot – traffic has since been navigating a temporary interchange.

But following a weekend closure, from Friday, 8 December to Monday, 11 December, A30 traffic flows will improve further as drivers will be able to travel directly east and west across the interchange, using the westbound lanes of the new dual carriageway.

Access will be maintained to the A390, A3075, B3277 and other local routes, while traffic from those roads will be able to join the A30 eastbound and westbound,

Neil Winter, National Highways' Senior Project Manager for the A30 scheme, said: "The opening of the Chiverton flyover to traffic will represent a real step forward at this end of the scheme, and the project as a whole.

"It means drivers wishing to continue their journeys along the A30 will no longer have to negotiate the temporary interchange and this should ease congestion as we progress the scheme at this location.

"Following the opening of the temporary interchange we did see additional congestion in comparison to the old roundabout but this has eased as drivers got used to the arrangement and after additional measures were introduced to ease traffic flows.

"Work during the weekend closure will enable us to open the new westbound section of the dual carriageway to traffic, albeit in single file, and if not by the Monday then certainly in the coming days.

"This partial opening will help traffic flows further, and we'll continue to do what we can to minimise congestion as we continue work to complete and fully open the split-level junction next year and move forward towards delivering this major highway upgrade for Cornwall."

The B3284 northbound was reopened to access the A30 at Chybucca at the end of September, and during the weekend closure, the new junction will be further opened for traffic.

The B3284 north and south links will be closed over the weekend, but from Monday drivers travelling north to south across the A30 will no longer have to negotiate traffic signals, instead using the new layout as per the below diagram: