Cool! I never thought of using snowflakes as indicators, but they are excellent. Presumably, one could go out at night and use a tightly focussed light to study selected areas. To expand scheduling opportunities, you'd need a friend with a snowmobile to kick up some fluff from the ditch on your windward side. A separate camera car would be great, too. I'm quite curious about how air gets to the underside of your tail, and how it settles down again.
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There is no excuse for a land vehicle to weigh more than its average payload.
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