A Colorado State Patrol investigation determined the two Colorado Department of Transportation workers killed Wednesday after being hit by a Jeep driver on U.S. 6 near Palisade were following proper safety guidelines. On Friday, CSP issued an update to the investigation into the deadly crash that killed CDOT employees Trent Umberger and Nate Jones and Jeep passenger Kathi Ann Wallace of Grand Junction. The Jeep was westbound on U.S.