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A witness has reported seeing A12 motorists driving the wrong way up a slip road to avoid traffic caused by a four-vehicle crash.

The A12 remains completely blocked following the crash on the northbound carriageway of the A12 between junction 18 for Sandon and junction 19 for the Boreham Interchange.

The anonymous witness said: "Accident on A12 just off the slip road by the park and ride northbound. Looks like four vehicles involved.

"See people coming up the slip road the wrong way to".

An off-duty roads policing officer, Sgt Collett added: "I’m on route to Colchester Zoo with the kiddies. Managed to come off in time and take the backroads.

"Take extra care at any of the junctions with the A12. Lots of idiots coming the wrong way in the on slips. Ambulances struggling to get through."

Essex County Council's Traffic Control tweeted: " A12 northbound – accident involving four vehicles BLOCKING the carriageway between J18 (Sandon) and J19 (Boreham) – queues back past J17 (A130/Howe Green)."

Congestion has already built back for around four miles back past junction 17 for the A130 Howe Green interchange, while there are also delays heading southbound as traffic is slowing to look at the crash scene.

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