A WOMAN has been left in critical condition after an incident on the A12.

The woman, in her 50s, has been taken to the Royal London Hospital where she remains in a critical condition.

Essex Police attended after reports of a woman being injured on the carriageway of the A12 at around 3.30pm this afternoon.

The South-bound carriageway of the A12 has now re-opened at Margaretting.

A rolling roadblock was in place on the North-bound carriageway to enable the air ambulance to land but has now re-opened. 

Traffic was diverted off the A12 at Junction 15, near Hylands Park in Chelmsford.

A Police spokesman said: "Officers were contacted at 3.30pm following reports that a woman was injured on the carriageway of the A12.

"Motorists are thanked for their patience and asked to avoid the area where possible.

"Traffic on the A12 remains extremely heavy and drivers are asked to avoid the area if they can."