You are driving a passenger car on an expressway with one lane in each direction, and the road surface is frozen. There is no variable speed limit sign. What maximum speed must you keep?
💡 Hint
The maximum speed on an expressway depends on the number of lanes in each direction, and in bad weather it is reduced by 20/100 or 50/100 (Article 19 of the Enforcement Rule of the Road Traffic Act). Be sure which reduction level an icy road surface belongs to.
Answer: ①
Explanation
The maximum speed on a one-lane-each-way expressway is 80 km/h (Enforcement Rule Article 19(1)3(a)). On a frozen road surface the maximum speed is reduced by 50/100 (Article 19(2)2), so 80 × 0.5 = 40 km/h. 64 km/h reflects only a 20/100 reduction.
Legal basis: 도로교통법 시행규칙 제19조 제1항 제3호 가목·제2항 제2호 나목