Which statement about this sign is correct?
Signs about passing an obstacle are told apart by whether the arrow goes around on one side only or splits to both sides (Enforcement Rule, Appendix 6). Also remember that caution signs are installed in advance, before you reach the hazard.
Answer: ②
Explanation
A triangular sign with arrows splitting around an obstacle is a caution sign warning that, on a road carrying traffic in one direction, there is a point where you must pass on both sides (Enforcement Rule, Appendix 6, No. 122). It is installed on roads with two or more lanes in each direction when there is an obstacle in the middle of the lanes, on the right side of the road 50-200 meters before the obstacle, so the option saying it is placed after the obstacle is wrong. Passing only on the right is shown by a different sign with a single arrow.
Legal basis: 도로교통법 시행규칙 별표6 122 양측방통행표지