POLICE are at the scene of a serious crash on the A12 near Chelmsford.
The accident has taken place between Junction 20 and Junction 19 of dual carriageway towards London.
Traffic is building up in both directions due to the incident.
Drivers have been advised to avoid the area if they can.
Police say the Londonbound carriageway is set to remain closed into the rush hour.
A spokesman for Essex Police said: "We are currently on scene of a serious collision which has closed the southbound stretch of the A12 between Hatfield Peverel and Boreham.
"It was reported two vehicles were in collision shortly before 11.50am today.
"One person has been taken to hospital in a potentially serious condition.
"Both carriageways are currently closed so we can investigate, recover the vehicles, and to allow repair work to be carried out.
"We anticipate the southbound carriageway will remain shut into this evening’s rush hour.
"Please avoid the area if you can and plan your route."
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Please be aware of #A12 J20-19 due to an RTC, we have @EPRoadsPolicing dealing on scene.
— Force Control Room (@EPControlRoom) June 21, 2021
The traffic is building up on both carriageways due to the incident please avoid the area if you can. #A12 #HatfieldPeverel #Chelmsford
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