You are driving a passenger car on a general road with two lanes in each direction outside residential, commercial and industrial areas. Snow has accumulated to 10 mm, and there are no speed limit signs or variable speed limit signs. What maximum speed must you keep?
💡 Hint
In bad weather, you reduce speed by either 20/100 or 50/100 of the maximum speed (Article 19(2) of the Enforcement Rule of the Road Traffic Act). First work out this road's basic maximum speed, then check which side of the 20-millimeter threshold the snow depth falls on.
Answer: ②
Explanation
The maximum speed on this road is 80 km/h (Enforcement Rule Article 19(1)1(b)). With less than 20 mm of snow, the maximum speed must be reduced by 20/100 (Article 19(2)1), so 80 × 0.8 = 64 km/h. 40 km/h would be a 50/100 reduction, which applies to cases such as 20 mm or more of snow.
Legal basis: 도로교통법 시행규칙 제19조 제1항 제1호 나목·제2항 제1호 나목