Semi Trailer Slides Off Icy Mountain Road and Drops Over Cliff Utah — A routine winter drive through a narrow mountain pass turned into a heart-stopping scene when a semi truck lost traction on an icy roadway, sending its trailer sliding over the edge of a steep cliff while the cab narrowly remained on the pavement. Dashcam footage shows the tractor-trailer creeping along a snow-dusted road carved into a rock face. As the driver rounds a gentle curve, the rear of the trailer begins to drift towa