MileCheckWhat is black ice, and how do you drive on it?
Black ice is a thin, nearly invisible layer of ice that looks like harmless wet pavement — which is exactly what makes it so dangerous. Here's how to spot it and what to do if you hit it.
Why it's called black ice
Black ice is a thin, transparent sheet of ice. It isn't actually black — it's clear, so you see the dark pavement right through it and it just looks wet. That camouflage is the danger: drivers don't slow down for what looks like a damp patch.
Where and when it forms
It forms when a thin layer of water freezes — after rain or melting snow refreezes, and in the early morning and overnight as temperatures drop. Watch for it on bridges and overpasses (they lose heat from above and below, so they freeze first), in shaded spots, and near the bottom of hills where water collects.
How to spot it
When it's cold enough to freeze, look for pavement that appears wet or glossy, especially on bridges and shaded stretches. If the road still looks wet but spray has stopped coming off other cars' tires, that "water" may be ice. Any time it's near or below freezing, treat suspiciously shiny pavement as ice.
What to do if you hit it
Don't panic and don't slam the brakes — hard braking can throw you into a skid. Ease off the gas, keep the wheel straight, and let the car slow on its own. If you start to slide, steer gently in the direction you want the front of the car to go. The best defense is prevention: slow down, leave extra following distance, and be especially careful on bridges. MileCheck's live DOT alerts flag icy conditions ahead, and your exact mile marker means that if you do end up stopped, you can report precisely where you are.
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Questions, answered
What is black ice?
Black ice is a thin, transparent layer of ice on the road. It's clear rather than black, so the dark pavement shows through and it looks like ordinary wet road — which makes it hard to see and easy to hit at speed.
Where does black ice form most often?
On bridges and overpasses (they freeze first because they lose heat from above and below), in shaded areas, and low spots where water pools. It's most common overnight and in the early morning when temperatures drop.
What should you do if you hit black ice?
Stay calm, ease off the accelerator, and keep the steering wheel straight — don't brake hard. Let the vehicle slow on its own, and if it slides, steer gently in the direction you want to go.
How can you tell if the road has black ice?
When it's near or below freezing, watch for pavement that looks wet or glossy, especially on bridges and in shade. If the road looks wet but no spray is coming off other tires, it may be ice.