Emergency personnel including a medical helicopter responded about 7 a.m. Thursday to a crash involving a motorcycle and a pickup truck on southbound I-255 at milepost 10 near the Route 3 exit in Dupo. The crash resulted in major morning traffic delays in that area.

Illinois State Police said a 1993 Harley Davidson motorcycle driven by a 33-year-old Columbia man rear-ended a 1992 Ford Ranger driven by a 67-year-old Swansea man.

The driver of the motorcycle was transported to a St. Louis area hospital via helicopter with life-threatening injuries, ISP said.

The incident remains under investigation.