The 110 million pound 5.5km long dual carriageway has been built to ease traffic between Newton Abbot and Torbay.
The opening of the road had been kept a secret to avoid any problems caused by hundreds of drivers wanting to be the first on the road.
The scheme started in 2012.
Chief constable won't be prosecuted
Charges against Will Kerr dropped, but he remains suspended
Pop-up market proposal for Exeter city centre
Entrepreneur eyes old bus station site
'Bad deal' blast over Churston solar farm
'There is only one response - shame on you'
Bovey Tracey holiday homes plan rejected
'These should be permanent homes for people who will invest in our community'
Broadside for 'incongruous' Kingsbridge waterside home
'This is so far wide of the mark'
Police investigating burglary and fraud in Exeter
They believe this man could help the investigation
