Early this morning police were called to a car accident near Cliff avenue and Benson road in Sioux Falls. Police say it looks like a drunk driver is to blame for hitting a semi and damaging a traffic signal in Sioux Falls. Police say the driver of a BMW ran a flashing red light and slammed into the passenger side of the semi truck. Two other people were in the car, one was hurt, but not critically, another refused treatment and the driver was arrested for driving while intoxicated. The driver of the semi truck was not injured in the crash.