Roads can be slippery in summer as well, both when the sun is shining and when it is raining.

When it is really warm and sunny, tar can penetrate out of the asphalt, making the road slippery.

When it rains after a heat wave, a slippery layer can be formed consisting of dust, exhaust emissions, oil residues and tyre deposits. Paving stones can become extremely slippery because of this. Grip is at its worst when it first begins to rain, as the slippery layer is eventually thinned out and rinsed off by continued rain.

Newly laid asphalt can also become very slippery when it is both rainy and sunny.

Read more about slipperiness during spring, summer and autumn