The A12 has been partially reopened following a serious crash.

A single vehicle is understood to have been involved in the smash on the northbound carriageway.

Both sides of the road between junction 22 at Witham and junction 23 at Kelvedon were closed for a short period to allow emergency services to deal with the incident.

The crash happened just after 12pm.

The southbound carriageway was also closed for a short period to allow an air ambulance to land at the scene. 

It has since reopened. 

One lane of the nourthbound carriageway has also been reopened but traffic remains heavy. 

A spokesman for the ambulance service said: "We sent an ambulance and the Essex and Herts Air Ambulance to the A12 between Rivenhall and Kelvedon after receiving reports of a collision at around 12.10pm today.

"Crews treated a male patient at the scene before transporting him to Broomfield Hospital by road for further assessment and care."