Photos and videos have revealed the scene of the serious crash on the A13.
The dual carriageway is still closed in both directions after the incident at about 9am this morning between the Manorway (A1089) and the A128 near Orsett.
Fire engines, ambulances and the air ambulance attended the incident.
The driver of the lorry has been taken to hospital with a head injury.
Police are advising people to avoid the area if possible.
There is a lot of congestion on all surrounding roads.
Police are appealing for information.
A spokesman said: "We need anyone who saw what happened to come forwards, in particular we need to speak to anyone who has dash cam footage of the incident.
"If you have any information please call us on 101 quoting incident 303 of October 16."
Videos: Ryan Morgan
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