A multi-vehicle crash has brought traffic to a standstill on a busy route.
The incident happened on the northbound A12 near Colchester, between junction 29 for Ardleigh and junction 30 for Stratford St Mary.
A spokesman for National Highways said: "Traffic has been held following a traffic collision.
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"[East of England Ambulance Service] are on scene.
"Delays are building, currently more than 60 mins on approach."
Traffic is slow back to junction 29 for the A120.
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