A new highway between Torbay and Newton Abbot in South Devon is expected to deliver better journeys for road users in the south-west and create hundreds of jobs.
It is also hoped that the 3.5-mile long road will benefit the tourism industry in the area and boost the local economy, according to the Department for Transport.
The road is now open and the transport minister expects for the £110 million investment in the highway to see a return of nearly £1 billion.
It will carry around 35,000 vehicles per day, due to the improved infrastructure in this area, which is part of the government's plans to repair roads in Britain.
Chancellor George Osborne said: "The government is determined to get Britain building again, which is why in my Spending Review I set out how we will invest over £100 billion in the UK's infrastructure."
Adding his thoughts about the South Devon highway, roads minister Andrew Jones said: "The road will help create new jobs and give a welcome economic boost to the region, but most importantly end the unpredictable travel times for drivers."