The A12 in Essex is closed northbound between J16 (B1007) and J17 All emergency services are working at the scene in a response being led by Essex police.
Fire crews from Essex county fire have also been called due to an entrapment.
For traffic approaching the closure locally a diversion route using local routes has been installed at J16 (B1007).
A strategic diversion route is available,and details and guidance is as follows;
Traffic is advised to leave the A12 at J15 (Webbs Farm A414 junction) and follow the A414 to the A414/A1114 roundabout.
At the roundabout take the second exit and onto the A414.
At the next roundabout take the first exit and continue on the A1016 to the A1016/A130 roundabout.
At the roundabout take the second exit and continue on the A130 to rejoin the A12 northbound at J19 Boreham Interchange.