Coalfields Highway was upgraded approximately 20 km west of Darkan in the Shire of West Arthur.
- Widening the road to 10 metres with 1.5 m sealed shoulders
- Realigning a 5 km section of curves
- Intersection improvements at Hill Street and Bowelling-Duranillin Road
- Relocating a parking bay
- Constructing a new section of Collie Darkan Rail Trail
The project improves freight connections from the Wheatbelt and Great Southern Regions to the Port of Bunbury.