Deaths on WA's roads are at a three-year high after a 25-year-old Camillo woman was killed yesterday.
The accident took the State's road toll to 157, seven more than at this time last year and equal to the 2009 carnage.
The woman was driving a Toyota Avalon on Gibbs Road, Banjup, when she apparently went through a stop sign and collided with a Ford Territory going north on Liddelow Road about 6.40am. It is understood she died instantly.
The female driver of the Ford was not injured.
Det. Sgt Mark Garner said major crash investigators were examining speed, inattention and weather as possible causes of the crash.
He urged drivers to be wary of conditions and not drive tired.
There are rumble strips on Gibbs Road on either side of the intersection to warn drivers to slow down.
City of Cockburn director of engineering and works, Michael Littleton, said the original rumble strips were installed in 1999-2000 after a fatal right-angle crash in 1997.
They were reinstalled after the road was resurfaced in September.
Police are also investigating the death of an elderly cyclist on Meadow Springs Drive, Meadow Springs.
It is not known whether the man in his 80s died from natural causes or was hit by a car.
Anyone with information on either crash is asked to contact Crime Stoppers on 1800 333 000.