On a road where the right-hand part is less than 6 meters wide, you want to overtake a slow truck. In which two cases must you NOT use the left-hand part of the road to overtake? Select TWO
On a road whose right side is less than 6 meters wide you may use the left side to overtake, but this exception has its own exclusions (Article 13(4)3 of the Road Traffic Act). Separate the reason you want to overtake from the grounds that forbid it, and judge by visibility and safety signs.
Answer: ①, ④
Explanation
On a road whose right-hand part is under 6 meters wide, you may use the left-hand part to overtake, except when you cannot see the left-hand part, when it may obstruct oncoming traffic, or when overtaking is prohibited or restricted by safety signs (Road Traffic Act Article 13(4)3). So a blind curve and a no-overtaking section are the answers. A slow vehicle ahead is merely the reason for overtaking, not a prohibition, and on a clear straight road with no oncoming traffic you may overtake using the left-hand part.
Legal basis: 도로교통법 제13조 제4항 제3호