Top picture: Truck equipped with rear mounted air foil and timed air "puffers" on tail lights. Driver had not brushed any snow off rear of tuck all morning.
Bottom Picture: Truck has no rear mounted air foil and no air "puffers" on tail lights. Driver brushes snow off tail lights every hour.
I have more pictures available. If you are interested in more pictures or more information: email: mlester@ttspec.com. Or visit: http://www.ttspec.com/.
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