Four people were injured in a four-vehicle accident Thursday afternoon on US 231, just north of I-64 in Dubois County. Police say the accident was triggered when the driver of a semi-tractor trailer sideswiped another semi. A car driven by 21-year-old Tiffany Vogler of Dupo, Illinois was hit by one of tractor trailers. Vogler and two passengers suffered non-life threatening injuries and were taken to Jasper Memorial Hospital for treatment. A Georgia truck driver was taken to Jasper Memorial for treatment of a minor head injury. The driver of the other semi and the other car were not injured.