You are driving a truck with a 5-ton load capacity on a section of a three-lane-each-way expressway that the Commissioner General of the National Police Agency has designated and announced for smooth traffic flow. What is this truck's maximum speed? (The weather is clear and there is no other speed limit sign.)
Expressway sections designated and announced by the Commissioner General of the National Police Agency have a higher maximum speed than ordinary expressways, but trucks over 1.5 tons of load capacity and similar vehicles have a separate, lower limit (Article 19(1)3(c) of the Enforcement Rule of the Road Traffic Act). Do not mix up the numbers that change with designation.
Answer: ③
Explanation
On a section of an expressway with two or more lanes each way designated and announced by the Commissioner General, the maximum speed is 120 km/h, but for trucks over 1.5 tons load capacity, special vehicles, hazardous material carriers and construction machinery it is 90 km/h (Enforcement Rule Article 19(1)3(c)). 80 km/h is what applies to this truck on a non-designated expressway with two or more lanes each way.
Legal basis: 도로교통법 시행규칙 제19조 제1항 제3호 다목