Workers on the highway upgrade have upped the ante with the fourth bridge completed in the past two months.
The new Old Coast Road south overbridge, which provides access over the new Pacific Highway for local traffic, is expected to open to traffic on Thursday, September 14.
This frees up another stretch of highway for unfettered construction progress.
All traffic will travel through the new roundabout at the southern end of Old Coast Road at North Macksville and the Letitia Cl side-track will be closed.
But traffic will continue to use a section of temporary road near the existing intersection of Old Coast Road and the old Pacific Highway until the new intersection is constructed.
There will still be some ongoing construction activity for finishing work along Old Coast Road which will include visual mound and local access road construction for nearby residents on the western side of the new bridge and sight screen installation.
The existing traffic lights on Old Coast Road will remain in place for about one month while these works are completed.
Traffic control will be in place during the day to manage site vehicle movements.
The bridge is 65 metres in length and 11 metres wide.
It has two spans and four girders that are 1.6 metres high and provides 5.3 metres clearance for vehicles on the new highway.
The Old Coast Road south overbridge is the sixth of 15 bridges to be opened to traffic since building work began on the Warrell Creek to Nambucca Heads project in late 2014.
Work on the remaining nine bridges is well advanced and they will be progressively opened to traffic in the coming months.