A crash involving a van and a car has shut the A12 at Chelmsford.
The northbound carriageway is closed between Junction 18 at Chelmsford and Junction 19 at Boreham.
One person was trapped in a vehicle following the smash.
Firefighters attended at 5.42pm and the casualty was freed from the vehicle 40 minutes later.
Delays on the northbound A12 currently stretch back as far as Junction 15, at the A414, Hylands Park.
There are also lengthy queues on surrounding roads, as drivers do their best to avoid the chaos.
The Baddow Bypass is particularly bad, approaching the Army & Navy roundabout, as is Princes Road heading towards the same junction.
On the A130 approaching Chelmsford there are long delays too.
