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What Causes Black Ice?

Stay safe with tips on black ice driving safety. Learn what causes black ice and how to navigate wintry roads effectively.

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A bridge in Connecticut, January 2004: Having left New York at 4:30 am, I settled into my Honda hoping to reach Maine before nightfall. The first couple hours were uneventful until… suddenly the wheel locked, the brakes failed and my car spun haphazardly across three lanes to face oncoming traffic. Yet somehow, we didn’t suffer a scratch between us.

I was lucky, and I want to encourage readers in the northeast to keep black ice in mind as you brave the roads this morning. And since this is Discover blogs, what causes the slippery stuff anyway?

Black ice is ice that forms without many air bubbles inside, commonly occurring on roads as moisture from car exhaust condenses. Because it’s transparent, it takes on the color of whatever surface it forms on–and if you can detect black ice at all, it generally looks like wet asphalt. It can also form when ...

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