Black ice is dangerous because the road may not look icy

Black ice is a thin, clear layer of ice that can blend into the pavement instead of looking white like packed snow. Bridges and overpasses, shaded areas, low spots, and pavement exposed to refreezing moisture can become slippery before nearby roads look obviously frozen.

Treat a winter road as suspect when temperatures are near freezing and the surface is wet, when snow has melted and is refreezing, or when other vehicles suddenly slow or make small corrections. The goal is to reduce speed before the low-grip patch, because there is much less you can safely change once the tires are already sliding.

If traction suddenly disappears, simplify what you ask the tires to do

Tires have limited grip on ice. Sudden acceleration, hard braking, and sharp steering compete for that small amount of traction.

  1. 01
    Ease off the accelerator

    Reduce power smoothly rather than lifting and stabbing the pedal repeatedly. If cruise control is on, cancel it without making an abrupt steering or braking input.

  2. 02
    Look where you want the car to go

    Keep your eyes on the open path and make only the steering correction needed. Large or rapid steering inputs can use up the little traction that remains.

  3. 03
    Avoid panic braking

    If there is room to coast, let speed come down gradually. If you must brake, use the procedure specified for your vehicle. On most modern ABS-equipped cars, maintain controlled pedal pressure and let ABS manage wheel lock rather than pumping the pedal.

  4. 04
    Wait for grip to return before making a second big input

    As the tires reach better pavement, keep the car settled. Do not immediately accelerate hard or snap the steering back because traction can change again a few feet later.

  5. 05
    Slow down for the next patch

    Increase following distance and reduce speed well below what felt comfortable on dry pavement. If multiple vehicles are sliding or treatment is poor, find a safe place off the roadway and reassess the trip.

Stop and get help

AWD, 4WD, ABS, and stability control cannot repeal the limits of tire grip

Electronic aids can help manage wheelspin, braking, and vehicle stability, but they still depend on the tires' contact with the road. Do not use AWD acceleration as proof that the road has enough grip to stop. If freezing rain, repeated sliding, crashes ahead, or road-closure warnings indicate unsafe conditions, delaying the trip is safer than testing the vehicle's systems at speed.

Before a winter Interstate trip, reduce the chance of being surprised

  • Check the forecast and state or local 511 road-condition service before departure.
  • Clear snow and ice from all windows, mirrors, lights, cameras, and sensors before moving.
  • Set tire pressure from the vehicle placard when the tires are cold and inspect tread and visible damage.
  • Use tires appropriate for the expected winter conditions rather than relying on AWD alone.
  • Leave cruise control off when snow or ice may be present.
  • Give bridges, ramps, shaded curves, and overpasses extra room because they can freeze before surrounding pavement.
  • Carry winter emergency supplies appropriate for the route and temperature, especially on rural or mountain drives.

Different slippery surfaces can feel similar but call for the same first principle

Black ice
Clear or nearly invisible ice on pavement, often around refreeze conditions

Assume traction is extremely limited. Reduce speed before suspect areas and avoid abrupt inputs if the car begins to slide.

Packed snow
A visible layer of compressed snow where traction can vary with temperature and traffic

Stopping distances remain much longer than on dry pavement. Smooth inputs and winter-appropriate tires still matter.

Slush over colder pavement
Wet-looking lanes where slush can hide ice or pull at the tires

Slow down before lane changes and watch for areas where meltwater can refreeze, especially after sunset or in shade.