Four dead in separate WA crashes

our people have died in separate crashes on West Australian roads in less than 24 hours.

The latest fatality came at 12.30pm WST Sunday when a 21-year-old woman was killed on Toodyay Road in Red Hill, northeast of Perth.

At 7.25am WST a 24-year-old woman died after her vehicle rolled over on the South Coast Highway in Jerramungup near Albany.

This was followed by a separate crash just before 8am WST when a 72-year-old man died after his truck and trailer rolled down a hill in Dwellingup, southeast of Mandurah.

A police spokeswoman said the Pinjarra-Williams Road at Old Williams Road was likely to be closed for most of the day in the aftermath of the crash.

On Saturday a 23-year-old died after his Kawasaki motorcycle collided with a 4WD on Julimar Road in Chittering, northeast of Perth.

A mother and her two children survived the crash with only minor injuries after their vehicle rolled down a steep embankment and caught fire.