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TRUCKERS' AWARENESS * USA - Winter Driving and Understanding Black Ice
What is black ice? ...
USA -Ask the Trucker-9 Oct 2009: ... Black ice is really just “regular” ice without air bubbles. Normally when ice forms on the roadway, tiny air bubbles are trapped inside and once frozen, the ice is visible to drivers due to these air bubbles that we are able to see. Black ice, on the other hand, forms when rain, fog or mist deposits ice along the pavement or roadway in cold weather. The latent heat of the surface will slow down the freezing rate. This slowing down process allows the droplets of water to run together before they can freeze. The air bubbles that are normally within ice are forced out and what is left is a frozen sheet of ice, minus the visible air bubbles, and we end up with a totally clear, transparent layer of ice which takes on the color of the background on which it is lying.... Because black ice is transparent and looks like the surface it is on, it makes it one of the most dangerous road hazards for drivers. While a shiny road surface is a signal as a wet or icy road, black ice simply cannot be seen. * Look ahead for pavement that is slightly darker and duller in color than the rest of the roadway or other surface. This is usually the best indicator that black ice is present.
Remember, black ice appears as the color of the material beneath it. When the weather conditions are right for “regular” ice … black ice will most often form as well. Slow down and keep your eyes moving to detect any change of color along the roadway ahead of you. If conditions become too dangerous, stop and park... (Photo: black ice on roadway)
Labels: truckers' awareness
posted by Unknown @ 7:22 AM
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