At what temperature does the risk of black ice on the road start even if the air temperature is a few degrees above zero?

Q: At what temperature does the risk of black ice on the road start even if the air temperature is a few degrees above zero?

Already at around +3–4 °C there is a risk of slipperiness. Already at low positive temperatures, the road surface can be cold and there is a risk of frost. For example, there can be ice on the road at +3–4 °C, especially on bridges and shady parts.

Question

Accepted Answer

Already at around +3–4 °C there is a risk of slipperiness

Only at 0 °C or lower

Not until it is -5 °C or colder

Explanation

Already at low positive temperatures, the road surface can be cold and there is a risk of frost. For example, there can be ice on the road at +3–4 °C, especially on bridges and shady parts.

Source: NTF

Last reviewed: May 2026

At what temperature does the risk of black ice on the road start even if the air temperature is a few degrees above zero?

Explanation

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