Essex Police were called to the multi-vehicle crash on the eastbound carriageway of the road near Chafford Hundred at 6.45am this morning (March 16).
Three vehicles were found at the scene, but an Essex Police spokesperson said that a fourth vehicle is believed to have “already left” before officers arrived.
Two people have been taken to hospital with minor injuries.
All three lanes of the road were shut between A1089 and A1012 while police worked at the scene.
It is understood that crash debris has been removed from the road and that all lanes are set to reopen shortly.
National Highways have said that normal traffic conditions are expected at around 10am this morning.