Highways England has progressed on improvement works for a section of the A21 in Kent.
Balfour Beatty are continuing to upgrade the 2.5 mile stretch between Tonbridge and Pembury from a single to dual carriageway.
A new lane will be added in each direction with upgraded junctions and an improved road layout.
With further development work scheduled to begin, a temporary speed limit will be introduced along with overnight carriageway closures on 7 June.
Anne-Marie Palmer, Highways England project manager, said: "We have been working hard behind the scenes getting ready for main construction and are still on target to complete the work by December 2016.
"We have been continuing the environmental advanced works to ensure that we carry out these improvements to the highest environmental standards."
Balfour Beatty Project Manager, Richard Turnbull, added: "We have been undertaking various activities along the route. In addition to the environmental mitigation works mentioned above, we have also carried out archaeological investigation and utility diversions without the need for a temporary speed limit.
"As construction progresses, this will now be installed to protect drivers and our workforce."
Highways England added the removal of grade two listed buildings is nearly completed, along with the relocation of the woodland.
Advance works on the carriageway began in 2014.
(LM)
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