Emergency services are currently at the scene of a road traffic collision.
East of England Ambulance Service (EEAST), the Essex Air Ambulance and the police were called to Hatfield Road in Terling at 10.53am.
EEAST spokesman Gary Sanderson said: "At present we are treating and stabilising a man in his 30s who has a neck injury believed non life threatening."
An Essex Police spokesman said: "The driver of a silver Peugeot 206 appears to have lost control of the car while travelling down Hatfield Road shortly before 11am and flipped it.
"A section of the road has been closed."
It is not yet clear when the road will reopen.
Update to follow.