What does the following safety sign mean?
On a caution sign, lines stand for road edges or lanes and arrows for the path vehicles take (Enforcement Rule, Appendix 6). Tell apart a line bending inward, an arrow going around an obstacle and a side road joining, then check whether the bend is on the left or the right.
Answer: ④
Explanation
A picture where the left line bends inward is a caution sign warning that the left lane ends on a road with two or more lanes in each direction (Enforcement Rule, Appendix 6, No. 120). It is placed on the right side of the road 50-200 meters before the lane ends, and repeated where speeds are high. If you are in the left lane, move safely into the right lane in advance. Keep-right, merging-road, and roadwork signs have different pictures.
Legal basis: 도로교통법 시행규칙 별표6 120 좌측차로없어짐표지