There are traffic delays and the right lane northbound blocked with emergency services on site.
Traffic has slowed on Forrest Highway with the northbound right lane blocked just south of Myalup after a truck rolled.
Four Department of Fire and Emergency Service crews were called to the scene at around 5.20am on Wednesday.
They remain on scene as they attempt to remove the truck, while traffic has slowed.
There are reports of minor injuries.
Meanwhile a man in his 60s has died following a truck rollover on South Coast Highway at Kalgan near Albany.
Female passenger dies after horror Kwinana Freeway crash
Havana Brown and Thelma Plum to headline 2026 Crab Fest
Hazmat warning issued after rubbish truck catches fire in Kwinana Beach
WA Police ramp up patrols near schools as students return for Term 1
Fire engulfs car then spreads to bushland in Oakford
Community bands together to provide essential school supplies to local children
Detectives continue to hunt man who dragged woman by hair into bushes in Halls Head
Woman airlifted to hospital following South Yunderup crash
Shire of Murray celebrates outstanding citizens