(Radio Iowa) — Authorities are still trying to determine exactly what caused a fatal crash in central Iowa. The state patrol says a Jeep Wrangler was parked along the westbound shoulder of Interstate 80 on Tuesday night at mile marker 133 in Polk County, where construction work is being done on the highway. For reasons unknown, the vehicle rolled into the ditch. Troopers say the driver was partly ejected and killed. He’s identified as 64-year-old Paul Penegar, of Urbandale.