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 temperatures are above freezing meaning it’s hard to be prepared. Unfortunately, four-wheel drive vehicles do not protect you from losing control and salt is also not as effective at freezing temperatures. And finally–as I observed firsthand–bridges and overpasses are often most dangerous because cold air circulates above and below elevated surfaces, making them freeze fastest.
I hope those driving on wintry roads today remember to be extra cautious.
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Given the winter storm blanketing the northeast, this is a re-post from March. Please drive carefully today.
Razib Khan is always up to something creative and Sunday night was no exception. Check out the google trend for “depression” he spotted unintentionally while searching for the economic meaning of the word:
This graph shows a clear seasonal trend and brings to mind the study on birth season that came out earlier this year from the University of Notre Dame. So perhaps we have yet another factor to consider in the equation of why winter babies seem to fall behind their peers… Might a parent’s emotional state at birth influence the child’s health and achievement later in life?
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 temperatures are above freezing meaning it’s hard to be prepared. Unfortunately, four-wheel drive vehicles do not protect you from losing control and salt is also not as effective at freezing temperatures. And finally–as I observed firsthand–bridges and overpasses are often most dangerous because cold air circulates above and below elevated surfaces, making them freeze fastest.
I hope those driving on wintry roads today remember to be extra cautious.
