Long delays remain on the A12 around Colchester after a serious accident this morning.
The southbound carriageway remains closed between the junctions for Colchester Community Stadium and Stanway.
Drivers are being strongly advised to avoid the area if possible.
The knock-on effect of the incident has seen thousands of cars diverted through Colchester.
Routes such as St Andrew's Avenue, Cowdray Avenue and the Avenue of Remembrance are said to be very congested.
A spokesman for Essex Police said: "We understand the collision took place on the southbound carriageway, which is likely to be closed for some time as we carry out our enquiries.
"The northbound road was closed to allow the air ambulance to arrive. Please avoid the area."
Drivers have also been warned not to turn around in the carriageway to try and escape the queues.
The spokesman continued: "We have also received reports of vehicles turning around on the A12 to avoid the traffic.
"This is unacceptable and can put you and others at risk."
A lorry has also broken down in the queues on the southbound carriageway near to Junction 29, the Crown interchange.
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