Highways England's £290 million improvement scheme, part of the Government's £15 billion Road Investment Strategy, will help to promote economic growth, improve journey times and increase safety by unlocking one of the last major bottlenecks in the county.
Roads Minister Baroness Vere said: "This Government is committed to delivering an infrastructure revolution and levelling up access across the country.
"This vital upgrade of the A30 will improve safety, cut congestion, boost access for drivers on their daily commute and create better journeys for the surrounding communities."
The 8.7-mile road scheme includes:
• a 70mph high-quality dual carriageway
• a two-level junction at Chiverton Cross and a new roundabout to ensure the free flow of traffic on the A30
• a new partial junction at Chybucca built on two levels with west-facing slip roads to provide access onto the dual carriageway from local routes
• new bridges at Tolgroggan Farm, Pennycomequick Lane and over the Allet to Tresawsen road to provide local access
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• a two-level junction at Carland Cross with a new roundabout north of the dual carriageway and re-using the existing roundabout to the south
• keeping the existing A30 as a local route with new sections where necessary to provide continuity and connectivity for local communities
Highways England Senior Project Manager Josh Hodder said: "We're delighted to receive the Secretary of State's decision, which represents a major step in developing a scheme to help unlock congestion, promote economic growth and bring out better connectivity for local communities along the A30.
"Improving the A30 between Chiverton and Carland Cross is incredibly important for Cornwall's future.
"It's the only remaining stretch of single carriageway on the A30 between Camborne and the M5 at Exeter; journeys on this part of the road are regularly delayed, congestion often brings traffic to a standstill, and as a result the Cornish economy is being held back."
Following the granting of planning consent, main construction works are scheduled to start later this year, with the route expected to be open to traffic in 2023.
During construction, the work will take place away from the existing A30 route to ensure continuity for traffic.
Mr Hodder added: "The existing A30 will remain open while the scheme is built alongside. We are currently finalising our construction partner, all phases of the work and associated traffic management will be explained to the local community before we start, and ongoing communication will keep people updated throughout.
"The cost of developing the scheme is being partly funded by an £8 million contribution from the European Regional Development Fund, with an additional £12 million for the construction phase. The remainder of the cost of developing and delivering the scheme is being funded by central Government."
Cllr Geoff Brown, Cornwall Council's Portfolio Holder for Transport, said: "This is very welcome news for Cornwall. The scheme will help to improve journey times for local people, businesses and visitors, there is strong support locally to improve this stretch of the A30, and the project will build upon the excellent working relationship that we have with Highways England."
Now a decision has been issued by the Secretary of State, there is a six-week period in which the decision may be challenged in the High Court.
