There's calls for improved safety on the Forrest Highway in West Pinjarra after three major crashes in just 48 hours.
The latest happened about 10.55am on Saturday, August 15 when a white Honda CR-V station sedan lost control and rolled on the highway near Greenlands Road.
The 45-year-old male driver and two children were conveyed to Peel Health Campus for treatment of minor injuries.
A 42-year-old female passenger was conveyed to Royal Perth Hospital for treatment of serious injuries.
The second crash happened about 11.25am on Friday, August 14.
A white MG travelling west on Greenlands Road and a silver Porsche travelling south on Forrest Highway collided at the intersection.
The 77-year-old male driver of the MG died at the scene while a 64-year-old female passenger of the Porsche suffered serious injuries and was taken to Peel Health Campus.
The first crash happened about 6.40pm on Thursday, August 13.
Police say a white Mitsubishi Pajero travelling south on Forrest Highway and a white Hyundai i30 turning right from Greenlands Road onto Forrest Highway, collided.
The impact caused the Mitsubishi to roll.
A male passenger of the Mitsubishi suffered critical injuries and was rushed to Royal Perth Hospital, while the 43-year-old male driver was taken to Peel Health Campus as a precaution.
The 25-year-old female driver of the Hyundai was conveyed to Fiona Stanley Hospital with non-life-threatening injuries.
Major Crash officers are investigating all three crashes and are appealing for anyone who witnessed the incident, or who has information relating to the crash, to contact Crime Stoppers via www.crimestopperswa.com.au or by calling 1800 333 000.
Community invited to name crane towers building new Mandurah Hospital
Hundreds of volunteers remove 525kgs of rubbish from Mandurah's waterways
Port Kennedy man fined $4.2k for failing to feed horse
Rockingham General Hospital patients face the longest waits for elective surgery
Australian-first drone technology to monitor emergencies, crimes in Baldivis, Kwinana, Rockingham
Teen accused of ordering firebomb attack on Baldivis tobacco shop
City of Mandurah sees sharp rise in animal cruelty reports
Geoff Valentine returns to Peel Thunder as senior coach
Golden Bay woman charged with lacing colleague's curry lunch with snail poison