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.
Stolen telehandler used in Plympton cash grab
Shop targeted in ram raid
North Devon Council u-turn's on trade waste
Backlash saves collection service
Exeter praised for safe and successful nightlife
City awarded Purple Flag status
Deaths of man and woman in two counties being linked
Woman found dead in Torquay; man in Hampshire
Dawlish's black swan lose nests in floods
At least 10 eggs washed away
Trains cancelled as flood damage continues
Divers to inspect infrastructure
