A 50mph speed limit has been lifted along a stretch of the A130 near Wickford.
The temporary speed limit was put in place for driver safety after routine investigations revealed issues with crash barriers close to the new third lane.
Emergency work to fortify the barriers has now been completed and the temporary speed limit has been lifted.
CountyRoute, who run the A130 on behalf of the Council, is now working on a long-term fix and the Council has agreed it will not open the third lane until this work is complete.
Currently ground investigations are being mobilised to confirm the extent of the works. CountyRoute is already in discussions with contractors so will be ready to carry out work once they have been agreed.
Further updates will be made public following the completion of investigatory works and the remedial works programme agreed.
Cllr Eddie Johnson, Cabinet Member for Highways and Transportation said: “I make no apology for putting the safety of drivers ahead of the opening of this new stretch of road – safety must always be a priority.
“Now the speed limit has been lifted, the road will continue to function as a normal dual carriageway.
“We do not currently have a date for the opening of the third lane but will make this public as soon as it is known.”
Work to create a third lane in both directions on the A130, between Howe Green and the Rettendon Turnpike, was originally triggered after 50,000 cars used the stretch of road in one day.
It comes 14 years after the northern section was first opened in January 2002 following a deal with CountyRoute, which was chosen by Essex County Council to construct and operate the road.