South Dakota DOT Testing New Snowplow Safety Program While it has been somewhat of a mild winter so far this year in the Sioux Falls area, there have been a few winter weather events that have required the use of snowplows. Each year snowplows across the country can easily fall victim to being struck by other motor vehicles as the plows are on the roadways doing their job. It's common for plows to kick up a snow cloud around it, which can quickly obscure the view of the plow to the public. As Dakota News Now reports, to help combat the risk on South Dakota roads and highways, the state Department of Transportation is running a pilot program that has placed a blue light in place of one of the left rear lights on 25 plows in northeastern South Dakota.