Practice question

Why is the initial period of rainfall (just after rain begins falling on a previously dry road) often the most dangerous driving condition?

  1. The vehicle engine experiences sudden electrical loss from airborne moisture
  2. Rainwater mixes with road dust, tire rubber residue, and oil deposits to form a highly slippery emulsion film (油泥薄膜)
  3. Vehicle brakes automatically disengage upon detecting moisture
  4. Pavement temperature drops instantly to freezing point

Answer: B — Rainwater mixes with road dust, tire rubber residue, and oil deposits to form a highly slippery emulsion film (油泥薄膜)

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