A serious crash which led to a man being taken to hospital in a life-threatening condition has blocked the A120 near Langham Moor.
A closure is in place at the road's intersection with the A12.
Previously, the road was also closed where it intersected with the A133, near Elmstead.
Essex police were called to the scene of the incident at 12.30pm today.
Both carriageways were closed to allow for the air ambulance to land.
Traffic was tailing back to Elmstead on the A120 although the road has now mostly been cleared.
There is still substantial congestion in Frating. Traffic also built up in Elmstead Market and Colchester, where the AA traffic map reported 7-minute delays.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here