The A12 Southbound is partially blocked between J22 (Witham North) and J21 (Witham South) because of an incident involving a car and a lorry.
An Essex Police spokesman said: "Police were called to a road crash on the southbound carriageway of the A12 near Witham which happened shortly after 2pm on Tuesday.
"A lorry and a red Ford Mondeo struck each other. Paramedics are at the scene assessing whether anyone has been injured."
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