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Highway 99 is more than a stretch of pavement winding through rugged terrain. It is a lifeline connecting communities, a route used daily by commuters, transport vehicles, tourists, and locals who know every curve of the road. On that day, however, heavy rains and unstable ground combined to create a catastrophic failure. Without warning, tons of mud, rock, and debris cascaded down the mountainside, sweeping across the highway with overwhelming speed and force.