Motorists heading for the A12 this morning have been warned to expect disruption following a collision overnight.
The carriageway is currently shut northbound between J19 for Boreham and J20 for Hatfield Peverel. It is expected to remain so for several hours, the Highways Agency said.
One lane is also closed southbound.
A diversion is in place.
Motorists are advised to exit the A12 northbound and join the A130 northbound and then join the B1137 northbound through Boreham and Crix.
At Hatfield Peverel, they can then continue on the B1137 to then re-join the A12.
