Black ice: how to spot it and what to do if you skid

Car Tips/Hacks11/13/2026
Black ice: how to spot it and what to do if you skid | Rooster

Black ice is one of the most dangerous winter road hazards precisely because you usually cannot see it. The road looks wet or simply dark, and the first sign of trouble is the steering going light or the back of the car stepping out.

You cannot always avoid it, but you can learn where it is most likely to be, spot the warning signs, and react in a way that keeps the car under control. This guide explains how.

Last updated 9 November 2026. Rules come from the Highway Code on GOV.UK.

Key takeaways

  • Black ice is a thin, clear layer of ice that lets the dark road surface show through, so it looks like a wet road.
  • It is most likely around 0C to 3C, early in the morning and late at night, and in shaded spots, on bridges and under trees.
  • Signs include quiet tyre noise, light steering, spray suddenly stopping, and frost on verges or parked cars.
  • If you skid, ease off the accelerator, avoid sudden braking and steer smoothly where you want to go.
  • Stopping distances on ice can be up to ten times longer than on a dry road (Highway Code Rule 126).

In this guide

What is black ice?

Black ice is not actually black. It is a thin, very smooth and almost transparent layer of ice. Because it is clear, you see the dark tarmac underneath, so it looks like an ordinary wet road.

It usually forms in one of three ways: rain or drizzle falls on a road that is below freezing, a wet road freezes as the temperature drops overnight, or melted snow refreezes. It can also form from fog or mist settling on a cold surface.

When and where black ice forms

The risk is highest when the air temperature is hovering around freezing, and road surfaces can be colder than the air. Many cars show a snowflake warning on the dashboard at around 3C or 4C for this reason.

Be most alert:

  • Early morning and late evening, when temperatures are lowest.
  • On bridges and flyovers, which lose heat from above and below and freeze before the road either side.
  • In shaded spots, such as under trees, beside high walls or hedges and in cuttings that do not get sun.
  • On quiet roads that are less likely to have been gritted.
  • At the bottom of hills and in dips, where cold air and water collect.
  • After a mild, wet day followed by a clear, cold night.

Warning signs to look out for

You may not see black ice, but you can often hear and feel it, or spot clues around it.

  • The road looks glossy or wet when the temperature is near or below zero, but there is no spray coming off the cars ahead.
  • Tyre noise suddenly goes quiet. Ice is smoother than tarmac.
  • The steering feels light or less responsive.
  • Frost on the verges, pavements or parked cars, which suggests the road surface could be frozen too.
  • Your car’s outside temperature reading is at or below about 3C.

If you suspect ice, slow down gradually without braking hard, and increase your gap to the car in front.

How to drive when there might be black ice

  • Slow down. Lower speeds give you more time and make any skid less severe.
  • Leave a much bigger gap. Aim for at least ten seconds to the vehicle ahead.
  • Be gentle with every control. Accelerate, brake and steer smoothly. Sudden inputs break the tyres’ grip.
  • Use a higher gear at low speed. This reduces the chance of wheelspin.
  • Brake before bends, in a straight line, rather than on the bend.
  • Avoid cruise control. You want full control of the throttle on slippery roads.
  • Keep your windscreen and lights clear so you can read the road and other drivers can see you.

What to do if you skid on black ice

A skid happens when the tyres lose grip. The aim is to let them regain it. Panic braking or yanking the steering usually makes things worse.

  1. Stay calm and look where you want to go. Your hands tend to follow your eyes.
  2. Take your foot off the accelerator. This lets the car slow naturally.
  3. Do not slam on the brakes. If you need to brake, do it gently. If your car has ABS and you are about to hit something, brake firmly and keep your foot down; the system will let you steer.
  4. If the back slides out (oversteer), steer gently in the same direction the back is sliding. If the rear goes right, steer right. Be ready to straighten up as the car recovers so it does not swing the other way.
  5. If the front slides and the car will not turn (understeer), ease off the accelerator and unwind a little steering. Once the front tyres grip again, steer gently.
  6. If you hit a patch of ice in a straight line, keep the wheel steady, stay off the pedals and let the car roll across it.

If you have an accident on ice

If you do crash, stop safely, switch on your hazard lights and check whether anyone is hurt. Call 999 if anyone is injured or the road is blocked. Swap details with any other drivers involved and take photos of the scene, including the road surface, as evidence that it was icy.

An icy road does not automatically mean nobody is to blame. Insurers expect drivers to adjust their speed for the conditions, so a driver who slides into the back of another car will usually be found at fault. Read our step-by-step guide on how to make a car insurance claim.

If you think the road should have been gritted, you may have a claim against the highway authority, though these claims are difficult to win.

Frequently asked questions

What temperature does black ice form at?

Water freezes at 0C, but black ice can be on the road when your car’s thermometer reads slightly above that, because the road surface can be colder than the air. Treat any reading of about 3C or below as a warning.

Can grit stop black ice?

Grit (rock salt) lowers the temperature at which water freezes and gives some grip, but it works less well in very low temperatures, and rain can wash it away. Untreated side roads are the biggest risk.

Do winter tyres help on black ice?

They help, because their softer rubber stays flexible in the cold and the extra grooves (sipes) grip better. But no tyre has good grip on clear ice, so you still need to slow right down.

Should I turn traction control off on ice?

No. Traction control and stability control help to prevent and correct skids. The only time to switch traction control off is briefly, if you are stuck and need to rock the car free.

Sources and further reading