Motorists are experiencing delays of up to 20 minutes after a five-car crash on an arterial road.
The incident happened on the London-bound carriageway of the A127 just before Pound Lane (Dick Turpin Junction).
Traffic is queuing back to Rayleigh Weir and motorists are being advised to avoid the route if possible.
Police are on scene but it's unknown if anyone was seriously injured at this time.
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