Driver's license written test question bank, effective 2026-03-09

424. Which of the following is not a correct explanation of black ice in winter?

  1. ①It is a phenomenon wherein a thin ice film forms like a coating on the road surface.
  2. ②It is a phenomenon wherein pollutants in the air are mixed with snow and moisture on the asphalt surface, absorbed, and then frozen into black ice.
  3. ③It occurs mainly in places with low temperatures during the winter season, such as on bridges, tunnel entrances, shady roads, and in the shade of mountain corners.
  4. ④It refers to the phenomenon wherein the snow melts and seeps into the sunny road, and the black color of the road is reflected by sunlight and sparkles.
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Answer ④

The English PDF has no explanation for this question. The Korean page carries the official explanation. Korean version of this question

Source KoROAD Safe Driving Integrated Civil Service, Driver's License Written Test Question Bank [English] (effective 2026-03-09), post 1923, Download the source PDF source PDF page 121 (checked on 2026-09-04). The question and answer are the KoROAD text as published. The buttons and notes on this page were written by the developer and have not yet been checked by a native speaker. The questions and answers themselves are the official KoROAD text.