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Good question. There are telephone poles or something off to the side, so that gets him in the vicinity, and I also noticed footprints or maybe a snowmobile track in front of him that he might have been following. Also, he backs up a bit every now and then, and maybe that gives him a view of the road surface. Although it looks like it's the grader behind him that's actually scraping down to the blacktop. So I really don't know.
Very cool video though.
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