When are road conditions typically most slippery?

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Road conditions are typically most slippery when it begins to rain after a dry spell. During a prolonged period without rain, dust, oil, and other debris accumulate on the pavement. When the first rains occur, this build-up can create a slick surface as the water mixes with the accumulated oils, leading to reduced traction and increased risk of skidding. This phenomenon often catches drivers off guard, making it crucial to exercise increased caution during the initial moments of rain following dry spells.

Although cold and dry conditions can lead to certain hazards, they do not have the same immediate impact on road traction that occurs with the first rain. Similarly, while snow can create slippery conditions, the full risk is typically associated with ongoing accumulation rather than its initial onset. Lastly, rising temperatures after freezing conditions can lead to melting ice, which creates different hazards rather than simply being slippery.