When driving in the rain, when is the roadway most slippery and dangerous?

Question

DentroTest · Accepted Answer

The most critical moment for grip when it rains occurs with the first drops. At that instant, the water mixes with the dust, oil and dirt accumulated on the dry asphalt and forms a thin, very slippery film of mud, popularly known as “slick”. On two-wheeled vehicles such as mopeds, this loss of friction is especially dangerous for stability in curves and when braking. Conversely, once it has rained heavily, the water washes away this greasy mixture and the road surface is less slippery than at the start. And a clean road surface, without loose gravel or leaves, offers better grip, not worse.

When driving in the rain, when is the roadway most slippery and dangerous?

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