LONG delays are expected on the A12 after a crash at Witham. 

Essex Police are on the scene after reports of a crash involving three vehicles. 

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One lane on the northbound carriageway is closed just after junction 22 (Witham). 

The crash is reportedly causing delays of up to 30 minutes. 

Queues are back to junction 20 (Hatfield Peverel), while traffic is also building through Witham.