A former Rebels bikie gang member and his pillion passenger were killed after they were thrown from their motorcycle when it hit a Jeep in Bullsbrook.
Errol Munro, 47, and his 39-year-old friend died at the scene on Wednesday evening when the Harley-Davidson they were riding struck the driver's side of a Jeep Cherokee as the driver allegedly pulled out of a driveway at a Neaves Road property just before 7.45pm.
Locals and passing motorists tried to treat the injured pair until paramedics arrived but they could not be saved.
Two men in the Jeep were not injured.
One man put a cross adorned with a motorcycle at the scene yesterday as a tribute to Mr Munro, a former sergeant-at-arms with the Rebels.
He was remembered as a good friend and family man.
A friend of the 45-year-old man driving the Jeep said the driver was extremely shaken by the crash.
The death of the motorcyclists takes the State's Christmas road toll to four.
A man died after his car rolled on the North West Coastal Highway in Yannarie, about 20km south of the Burkett Road intersection, on Wednesday morning.
It is understood the man was trapped under the wreckage and passers-by could not free him.
Nathanyal Jaeger, 17, died in Castletown, Esperance, early on Monday when the car he was driving hit a power pole. The national holiday road toll is 22.
Eleven people escaped with only minor injuries yesterday after a serious crash in Parkfield.
Their three cars, one towing a caravan, collided at the intersection of Old Coast Road and Treasure Road just before 10am.
One man was trapped briefly in his car, however all passengers were safely out of their vehicles by the time firefighters arrived. Nine people were taken to Bunbury Hospital for checks.
The crash caused long delays, with heavy holiday traffic diverted around the crash for several hours.
Police have appealed for witnesses to the crashes to call Crime Stoppers on 1800 333 000.