Major infrastructure works are progressing steadily in Gunnedah.
Roads and Maritime Services (RMS) said the second rail overpass project was "on track" and the bridge piling work and flood mitigation work on the rail culverts had been completed.
Construction of the bridge abutments and piers has started and the bridge girders have been manufactured and delivered to a local storage yard.
Over the next three months, work on New and Warrabungle streets and construction of the bridge foundation, including installing headstocks, will continue.
The new Oxley Highway roundabout at the intersection of New Street and South streets is well and truly under way.
An RMS spokesperson said after New Street is reopened in March, View Street will be temporarily closed at the Oxley Highway intersection for up to four months .
"This will allow work on the existing roundabout to be carried out at the same time as the bridge work, reducing the overall impacts on the community," they said.
Reduced speed limits of 40 km/h on the Oxley Highway will remain until the project is completed.
Preparations for the construction of a new roundabout at the intersection of Boundary Road and the Oxley Highway are ongoing and the RMS said it should be finished in May 2020, weather-permitting.
"New storm water lines have been installed and work is continuing on earthworks to construct the roundabout," the RMS spokesperson said.
The intersection is a main thoroughfare for trucks turning onto the heavy vehicle route to travel in the direction of Coonabarabran and was identified in the Oxley Highway corridor strategy as needing an upgrade.