Amber light
Frost Warning (Snowflake)
The outside temperature is near or below freezing, so the road may be icy.
Normal risk
Drive carefully: bridges, shaded areas and wet roads can be icy.
Short answer · What does the snowflake symbol mean?
It warns that the outside temperature is low enough for ice to form, usually from about 3–4 °C. The road may be slippery even if it looks dry.
What to do
- Reduce speedAllow longer braking distances.
- Watch for black iceEspecially on bridges and in shaded areas.
How is the light behaving?
| What you see | What it usually means | What to do |
|---|---|---|
| Steady | Risk of ice | Drive carefully |
| Flashing | Temperature just dropped into the frost range | Drive carefully |
Possible causes
- Low outside temperatureNormal information.
Don't confuse it with
Questions about Frost Warning (Snowflake)
Why does it come on above 0 °C?
Road surfaces can be colder than the air, so many cars warn from about 3–4 °C.