You are driving a car on a three-lane (each direction) expressway whose surface is wet from rain. An electronic variable speed limit sign shows 90 km/h, while another maximum speed sign by the road shows 110 km/h. What maximum speed must you observe?
💡 Hint
The weather-based reduction rules are in Article 19(2) of the Enforcement Rule, but the same paragraph has a proviso for cases where the maximum speed is set by a variable speed limit sign. Work out which sign prevails when the figures differ, and whether a reduction rate is applied again on top of it.
Answer: ④
Explanation
Under the proviso to Article 19(2) of the Enforcement Rules, when the police set a maximum speed with a variable speed limit sign, drivers follow that sign instead of the weather-based reduction rules, and if it differs from another safety sign, the variable sign prevails. So the maximum is 90 km/h; reducing it again by 20% or following the 110 km/h sign is wrong.
Legal basis: 도로교통법 시행규칙 제19조 제2항