(Forest Grove, OR) -- A rider on a mobility scooter was killed in a crash Saturday morning in Forest Grove. The crash happened at Pacific Avenue and Oak Street. The 71-year-old woman riding the scooter died at the scene. The driver stopped and cooperated with investigators. During the investigation, another vehicle drove past a road closure sign with a police car and a public works truck with their emergency lights on. The driver was stopped and arrested for DUI. Their blood alcohol level was twice the legal limit.