The A127 eastbound is blocked following a crash involving five vehicles.
The road is blocked after an accident that took place shortly before 8:30 this morning (Thursday, March 29).
Traffic is building up as the incident occurred between M25 slip road at junction 9 for Romford and Childerditch Lane.
Brentwood and Great Warley will be affected by the congestion in the morning rush hour.
The accident is blocking the carriageway between the M25 and the A128.
Commuters travelling from the M25 towards Southend-on-Sea may be affected.
Motorists are advised to allow extra time to their journey due to the delays and to find an alternative route if possible.