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.
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