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.
Leisure company gets £975,000 loan from council
It's yet to pay back £1.6 million
Massive Exeter student flats block gets the go-ahead
'It's a gateway site, so it needs a gateway building'
Giant solar plan on hold
It would cover 2,700 acres near Holsworthy
Rare King Colobus monkey born at Paignton Zoo
Second endagered monkey born in Devon
Torquay man jailed for cannabis smuggling plot
5 years for Leon Day
20-year healthcare partnership in Torbay under threat
Calls for Trust to think again
