Alberta Class 7 Learner Knowledge Test · Question
Why is the first rainfall after a long dry period especially slippery?
During a dry spell, oil, dust, and rubber accumulate on the road. When light rain first falls, it mixes with these deposits to create a slippery film. Until hea
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Question: Why is the first rainfall after a long dry period especially slippery?
Answer options:
- Rain washes away the road paint ✅ Oil and dust on the road surface mix with the water and form a slick film until the rain washes it away
- Rain hardens the asphalt
- Rain reduces tire pressure
Correct answer: Oil and dust on the road surface mix with the water and form a slick film until the rain washes it away
Explanation: During a dry spell, oil, dust, and rubber accumulate on the road. When light rain first falls, it mixes with these deposits to create a slippery film. Until heavier rain washes the surface clean, drivers should reduce speed and increase following distance.
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Question explanations
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