Semi-Truck Crashes Through Guardrail and Plunges Off Snowy Mountain Highway Rocky Mountain Pass — A terrifying crash was caught on camera after a semi-truck lost control on a snow-covered mountain highway and barreled through a guardrail, plunging off the edge into a steep ravine below. The footage shows the tractor-trailer sliding toward the shoulder as winter conditions and limited traction overwhelm the driver’s ability to correct. As the truck drifts wider, its front wheels strike the guardr