Motorists were being warned to avoid part of the A12 this evening following a collision.
Emergency services have been called to the road southbound at Junction 29 for the Ardleigh Interchange.
Essex Police say it will be closing the road to protect emergency services which are attending the scene.
Essex Road Policing Unit asked on Twitter for drivers to avoid the area at this time.
The road reopened just before 8pm.
Officers had to deal with a number of broken down vehicles caught in the tailback which had all got flat batteries.
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