Driver has early evening road sighting on Interstate 84 southeast of Pendleton witnessed in Umatilla County, Oregon

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I was returning to my home in Kennewick, WA, after delivering Christmas gifts to relatives in southern Idaho. It was early evening (around 5:45 pm), and I was driving in the westbound lanes of I-84. I had encountered heavy, thick fog at the top of what is locally known as "Cabbage Hill". It also began to snow. The roadway was snow-covered and slick. Traffic was moving quite slowly (20-30 mph). Trucks were moving especially slow due to the steep roadway, poor visibility, and slick roads. Traffic was backing up. There were 5-6 vehicles, including mine, travelling as a group, with 2-3 in the left lane and 2-3 in the right. The westbound lanes make a sharp turn to the right, straighten, steepen their grade, go through a cut in the hillside, and make a turn to the left, crossing Patawa Creek. This was in the vicinity of milemarker 222. There is a guardrail alongside the exposed side of the westbound lanes when they are not protected by embankments. As we were driving on the straight secti...