Road Safety Minister Liza Harvey provided Parliament with an update on the nine-month review on Wednesday last week.
The review found almost 200 people were killed or seriously injured in crashes on the Wheatbelt sections of Toodyay Road and Great Eastern Highway, and the Great Southern Highway between Chidlow and York, in the five years ending 2013.
The Deputy Premier said highway safety reviews in other states resulted in significant improvements in road trauma outcomes.
“These serious crashes mostly involved a single vehicle running off the road,” Ms Harvey said.
“Twenty-nine of the serious crashes also occurred at intersections.”
Residents who attended the road safety forums held last year helped identify areas of concern followed with a technical assessment of the routes.
Safety concerns put forward included the lack of passing lanes, their placement, dangerous intersections, the condition and width of roads, and the challenges of faster and slow moving traffic.
The $3.8 million from the Road Trauma Trust Account will fund environmental reviews and pre-construction work, paving the way for Toodyay Road improvements.
Also in the pipeline are plans for a Great Eastern Highway Road Safety Alliance to build on existing networks in Wheatbelt communities.
Ms Harvey said a detailed report and recommendations would be released soon.