Drivers will need patience on a major road after an accident causes long delays in the afternoon. 

The A12 northbound is experiencing long delays after an accident near Hatfield Peverel at the junction 20. 

Long delays with more traffic than usual started to form in the afternoon, reaching back to junction 19 near Boreham. 

Travellers towards Colchester are advised to divert to avoid the partially blocked road until further notice.