There are long tailbacks on the A12 following two crashes on both carriageways.
According to National Highways there are delays of 80 minutes on the northbound carriageway, near Kelvedon after a multiple vehicle collision.
Queues are up to seven miles long and vehicles moving at an average speed of 9mph as a result says the highway's agency.
Ambulance crews have been sent to the crash but the extent of any injuries are not yet known.
In a separate incident, the southbound carriageway was closed following a crash, near Hatfield Peverel.
The carriageway has now reopened with motorists told to expect long delays.
Ambulance crews were also sent to the crash.
It is not yet clear how many vehicles have been involved in the crash or the extent of any injuries.
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