A 47-year-old motorcyclist is in hospital after colliding with a car in Ballajura, as police investigate at least half a dozen serious car incidents in the first two days of the long weekend.
The crash happened around 2.28pm when a black Suzuki motorcycle was traveling North West on Illawarra Crescent and a white Toyota Hilux was traveling North East on Marangaroo Drive.
Police say the vehicles then collided at an intersection of the roads.
The 47-year-old male rider of the Suzuki suffered serious injuries and was taken to Royal Perth Hospital for treatment, where he remains in a stable condition.
The 56-year-old female driver of the Toyota was not injured.
Another motorcyclist, understood to be a senior member of the Mongols gang, was rushed to hospital on Friday night following a crash on the Kwinana Freeway.
Later that night, a 47-year-old man died when a Mitsubishi sedan and a Lexus SUV traveling south on Bussell Highway collided near the intersection of Sues Road.
Hours later, an 84-year-old female driver and the 88-year-old male passenger died in Port Denison after their Mazda CX-5 collided with a Holden Commodore on Port Leander Drive about 7.30pm.
In the early hours of Saturday morning, a man in his 30s had to be rushed to the hospital after being struck by a car in Rockingham.
The driver of the vehicle allegedly left the scene without stopping, but later returned and was charged with failing to stop and ensure assistance was received after an incident occasioning bodily harm.
A 66-year-old man has died following a car crash in Argyle on Sunday morning, becoming the fourth person to lose their life on WA roads so far this long weekend.
Major Crash investigators are examining the scene and are appealing for any witnesses to call Crime Stoppers on 1800 333 000 or report the information online at www.crimestopperswa.com.au.