On a road with three lanes in each direction that is not an expressway (no exclusive lanes), which statement about the lane-use standards by vehicle type is NOT correct?
On roads other than expressways, the lanes are split in half into left and right lanes, and if the number is odd the middle lane is left out (Annex 9, Note 1 of the Enforcement Rule). Also check the rules on using lanes to the right of your designated lane and the exception for overtaking (Notes 2 and 3).
Answer: ②
Explanation
On roads other than expressways, the "left lanes" are the half closest to lane 1, and if the number of lanes is odd the middle lane is excluded, so on a three-lane road lane 1 is the left lane and lanes 2-3 are the right lanes (Enforcement Rule Annex 9, Note 1). Passenger cars are therefore designated lane 1, and large buses and trucks lanes 2-3. Every vehicle may use lanes to the right of its designated lane (Note 2), so passenger cars may also use lanes 2-3, making the second option wrong. When overtaking, a vehicle may use the lane immediately to the left of its designated lane (Note 3).
Legal basis: 도로교통법 시행규칙 제16조 별표9