WORK on the state government's $6.2 million 2-Plus-1 Midland Highway development has restarted.
The 4.5-kilometre stretch has been zoned as 60 or 80km/h during roadworks in winter.
The project is in response to safety concerns about the Symmons Plains vicinity, which the Department of Infrastructure, Energy and Resources has marked as a serious crash location.
Shoulder widening of the highway section will allow two lanes in one direction and one lane in the other direction, interchanging every 1.5kilometres.
A DIER spokeswoman said works on the development restarted this week.
"This project has been scheduled over two construction seasons and some elements of this project were not able to be undertaken over the winter period, due to the cold and wet weather," she said.
"There have been some minor issues with drainage caused by the excessive rainfall over winter, but these have now been addressed."
She said works were "still on track for completion by March 2014".