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Winter Driving and Understanding Black Ice

Oct
7,
2009
2

black ice on roadwayWith the Winter season fast approaching and already showing signs in some parts of the country, it’s important to understand the signs and dangers of one of Mother Nature’s phenomenons:  black ice.  There really is no big mystery when it comes to black ice.   Understanding this Winter roadway danger, will make the new truck driver that more safer if and when black ice is ever encountered.

What is black ice? 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.

When does black ice form? This form of ice most often forms just around the freezing point of 32 °F, however, due to various atmospheric conditions black ice can form when temperatures are even above freezing.  For instance, in extremely cold regions, black ice will form on the frozen ground and roadways although the outside ambient temperatures are above 32 °F. Black ice can form with freezing temperatures even from such things as heat from the tires on the roadway and exhaust fumes from vehicle pipes.  Black ice tends to form in the early morning and evening hours.   Key factors to remember is that black ice can occur if temperatures are near the freezing mark or even a few degrees above it, and that bridges and tunnels are prime areas.

Black ice awareness: 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.  However, there is one thing that drivers can make themselves aware of in order to at least be on a better lookout for this dangerous formation:

  • 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.

Drive safe …

© 2009, Allen Smith. All rights reserved.

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By: Allen Smith

Allen Smith is a 34 year veteran ( started at an early age in family moving business) of the trucking industry, many of those years spent over the road. He has been an owner operator, company driver, operations manager, and has owned and operated a moving company, taking many of the long haul moves himself when needed. One thing though that most will say is that the reason and motivation behind the author, Allen Smith, is the fact he is driven by the desire to help others succeed within an industry where injustice, unrewarded sacrifice, and lack of respect and recognition exists. As you read many of the blog posts you’ll discover that he is opinionated and speaks openly about the ongoing issues of the trucking industry. He supports other fellow advocates who are also stepping up to the plate to help those who are in need of honesty, guidance and direction. The list of supporters and like minded people grows daily and their ability to network together and share their thoughts and ideas for the betterment of others within trucking, has allowed the forward movement of... "Raising the standards of the trucking industry"

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2 Responses to Winter Driving and Understanding Black Ice. - Post a Comment

  1. [...] This post was mentioned on Twitter by Micheal Duke. Micheal Duke said: RT @truckerapp: Winter Driving and Understanding Black Ice: With the Winter season fast approaching and already.. http://tinyurl.com/y9zoevf [...]

  2. Christie

    Hey all! I just got a phone call last night from one of my students asking me questions about chain laws, this post is really for the students or “newbies” that come to this site. PLEASE, if you’re not certain of what your chain laws are for each state that you will be traveling through, please find out. I have a student who didn’t make sure of his laws and just received a citation in the state of Oregon!! Please if you don’t know, ASK! He could have prevented this by asking a few questions!! (just my thoughts)

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