A man and woman in their twenties have lost their lives on the South West's roads.
WA Police confirming the fatalities this afternoon after the car crashed into a tree and flipped on the Forrest Highway.
It was confirmed the car was pulled over in the early hours of Thursday in Busselton for a random breath test, but the driver sped off.
The crash was first reported to police at around 6:30am and affected traffic all morning.
Anyone with information can call Crime Stoppers on 1800 333 000 or report it online at crimestopperswa.com.au