I remember in around 1976 -77 in Colorado El Paso county when I was a deputy sheriff riding in a surplus army weasel with the mounted rangers. Digging out stranded cars on hwy 24 . Breaking window to check for survivors. Thankfully most were vacant. Some tragically not. 20 high drifts. If I remember correctly 6 people did not make it. Two were a tow truck driver and his customer no winter gear etc.