Semi Loses Control on Icy Mountain Curve, Trailer Slides Off Roadway Colorado Rockies — A winter drive through a mountain pass turned dangerous when a semi truck lost traction on an ice-covered curve, sending its trailer sliding off the roadway and into the trees as nearby drivers struggled to stop. Dashcam footage shows cars creeping along the snow-packed road when the tractor-trailer ahead begins to drift. The trailer swings wide, scraping past the guardrail before dropping off the edge and co