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.
Students connect with elderly residents to combat loneliness
International students creating lasting friendships
Crackdown on anti-social behaviour in Plymouth
PSPOs proposed for six city centre car parks
£1.6 million for more energy efficiency Devon home upgrades
41 properties improved over last year
SWW to build huge new Churston solar farm
Council could opt out of building and lease the land instead
MP highlights Devon's dentistry 'crisis'
'People are in pain but are unable to access treatment'
