The A12 near Boreham was closed for a number of hours last night after a serious crash.
Police were called to a slip-road on the London-bound carriageway at about half six.
Both sides of the road were initially shut as long queues built up and officers say they couldn’t re-open the stretch due to abandoned cars.
A few drivers were also turning around and driving the wrong way down the carriageway to try and avoid the hold-ups.
There’s still no news on the condition of those involved in the collision.