A truck driver from Crawford County escaped serious injury after the semi he was driving dropped off onto the shoulder of Interstate 80 in Pottawattamie County, and rolled onto its side. The accident happened as 45-year old Michael Melvin Wilken, of Westside, was being pulled over by an Iowa DOT Enforcement Officer Sunday evening, on I-80 westbound, near the 45-mile marker. Wilken refused medical treatment at the scene. The trailer he was pulling was full of hogs. There was no word on injuries to the animals.