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11-17-13 | 07:05 PM

#32

JohnJ80

Senior Member

Joined: Feb 2011

Posts: 4,681

Likes: 253

From: Minnesota

Bikes: N+1=5

[h=2]Definition[edit][/h]The term black ice is inaccurately used to describe any type of ice that forms on roadways, even when standing water on roads turns to ice as the temperature falls below freezing.[SUP][citation needed][/SUP] The American Meteorological Society Glossary of Meteorology includes the definition of black ice as "a thin sheet of ice, relatively dark in appearance, [that] may form when light rain or drizzle falls on a road surface that is at a temperature below 0 °C."[SUP][1]

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Above from wikipedia and is accurate.

Here in Minnesota it forms because of frost usually early in the season before there has been any salt on the roads. Once there is *any* salt residue which happens pretty early in the winter/fall season. After that, it doesn't form unless the temp gets below -8F where salt generally quits working. Our main problem is when it is deep below zero and then during rush hour the discharge of moisture from tail pipes (liquid and vapor) causes a glaze to form that is hard to see.

J.[/SUP]

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