A Ripon man was seriously injured in a car vs motorcycle crash in Fond du Lac County. The crash happened shortly after 9pm Tuesday on Highway 23 west of Rosendale. A preliminary investigation shows both vehicles were traveling westbound on 23 when the motorcycle was struck from behind. The motorcycle operator, a 35 year old Ripon man, was flown by helicopter to a hospital with serious injuries. The car driver , a 36 year old Malone woman, was not injured. Alcohol is believed to be a factor in the crash.