An 89 year old woman was seriously injured in a traffic crash in Carlotta, 20 kilometres south of Nannup, on Monday October 22 2018.
A white Toyota Prado was driving south on Vasse Highway just before 4am, when it drifted into the north bound lane and onto the gravel verge, before rolling onto Vasse Highway.
The 57 year old male driver and a 54 year old female passenger received minor injuries.
An 89 year old female passenger was seriously injured and was taken to Bunbury Regional Hospital.
Major Crash Investigators are now seeking information about the incident.
If you saw the white Prado before the crash, please call Crime Stoppers on 1800 333 000 or report the information online at www.crimestopperswa.com.au