Crews are preparing to open the third lane along the southbound stretch of the A130 between Rettendon and Howe Green.
CountyRoute, which maintains the A130 on behalf of Essex County Council, is hoping to open the southbound third lane in late March 2018.
Crews have completed 1,400 metres of embankment works this winter, despite the recent snow and ice throwing up additional challenges.
The opening of the third lane had previously been delayed to allow works to reconstruct the ground alongside the carriageway as a preventative measure to protect against the possible risk of embankment slippages in the long-term.
The work is being completed at no additional cost to the taxpayer thanks to Essex County Council’s agreement with CountyRoute.
Works continue on the northbound A130 third lane, which is expected to open in summer 2018.
Cllr Ian Grundy, Essex County Council Cabinet Member for Highways, said: “As a local resident and cabinet member for highways, I’m glad that drivers will soon be able to feel the benefit of a third lane along the southbound stretch of the A130.
“It is a vital route used by around 50,000 vehicles a day so I’m sure drivers will welcome the extra capacity.
“I would like to thank drivers for their patience during the works, which have come at no additional cost to the taxpayer thanks to our agreement with CountyRoute.
“I know it may have been frustrating at times, but I make no apology that our focus has always been to create a safe and long-lasting road that will help keep Essex moving for years to come.”
Drivers are being asked to be aware of the new road layout and signage when the southbound third lane is opened.
If drivers need to stop they can still pull onto the verge in an emergency, although wherever possible we would advise drivers to try to use the three laybys at regular intervals along the road.
Overnight road closures may need to be put in place at short notice to allow crews to safely remove all remaining traffic management.
Details of these will be given on advanced electronic signage and on our @EssexHighways Twitter account, with clearly signposted diversions in place throughout any closures.