It is part of a $100 million road and rail package.
Scott Morrison is set to announce the package for WA today.
The Prime Minster is currently in WA on a three day blitz of the state.
The package is set to widen the Kwinana and Mitchell Freeways, and upgrade bottlenecks at Hazlemere, Alkimos and Kewdale.
It will also fund a new train station at Lakelands on the Mandurah Line.
The Prime Minister started his tour of WA yesterday with a visit to the Henderson ship yards and a politics in the pub event last night.
He'll wrap up his visit tomorrow.
Aerial firefighter loses Serpentine home in devastating blaze
Rumours Rockingham councillor Ryan Robertson to be announced as Liberal candidate for Secret Harbour by-election
Baldivis man fined for throwing ex-wife's elderly dog
Concerns for missing woman last seen in Baldivis
Peel Cavaliers break nine-year drought to win Country Championships
City tees up new vision for Kwinana Golf Course
Warnbro man charged with more child abuse, animal cruelty offences
Teen threatened, robbed by offenders on e-scooter in Mandurah
Labor candidate for Secret Harbour Georgia Tree vows to fight for locals