'Snow Man'

摘要

"When the ground is completely snow-cpvered, a motorist's visibility ... is inversely proportional to the fifth power of wind- speed," according to the National Transportation Board's "Controlling Blowing and Drifting Snow," by Dr. Ronald D. Tabler. Among the many studies on blowing snow issued by the nation's Department of Transportation and State highway agencies, it's rare to find a document that is not written by (or quoting) this same expert.