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.
Calls for inclusion on Plymouth lord mayor role
It traditionally alternates between Conservative and Labour
Upgrades to Plymouth storm overflows to take place
Hoe bathing waters are priority to stop sewage discharges
Dartmoor finances facing biggest cut for years
'Do DEFRA think the Dartmoor pixie exists?'
Rare curlews and martens are leaving Dartmoor - for now
'We hope some of them choose to come back to the wonderful place that is Dartmoor'
Dartmoor phone mast gets the go-ahead
Better broadband and emergency cover promised
Livestock processing plant refused at Shebbear
Concerns about neighbouring land
