A dashcam captured a heart-stopping crash on a mountainous highway in Colorado when a semi-truck hit a patch of ice, jackknifed, and flipped over. The clip shows snowy conditions just before the large truck begins to lose control, its trailer sliding out. In a matter of seconds, the trailer swings across the lanes, forcing the cab into a skid that ends with it rolling onto its side in a plume of snow. “It was a surreal, terrifying moment,” said the driver who caught it on video. “You just pray e