High speed and alcohol are considered contributing factors in a serious motorcycle accident west of Milton Thursday night. The Rock County Sheriff's office says 49-year-old Bart Schmidt of Janesville appears to have failed to negotiate a curve on East County M, just west of North Kidder Road around 9:00 o'clock. He was thrown from the bike, and suffered severe head and face injuries. He was not wearing a helmet. Schmidt was arrested for operating a motor vehicle while under the influence of intoxicants.