The eastbound carriageway of the A120 outside of Colchester has been closed after a car overturned.
National Highways said on Twitter the north Essex road had been sealed off at Elmstead Market at about 1.45pm.
Essex County Council's Traffic Control Twitter said a vehicle had overturned just after junction 29, leading to the A133 and Clacton.
The AA traffic map is suggesting motorists are queuing as far back as Colchester and the turn-off for the A12.
For up-to-date information about the county's roads, visit our LIVE traffic map.
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