Which statement about this sign is correct?
A caution sign is placed BEFORE a hazard to warn of it, while prohibiting traffic is the job of a round red regulatory sign (Enforcement Rule, Appendix 6). Distinguish what a steam locomotive picture and a tram picture each point to, and check whether the sign is placed before or after the spot.
Answer: ④
Explanation
A steam locomotive picture is a caution sign warning of a railroad crossing; it is placed on the right side of the road 50-120 meters before the crossing and installed repeatedly at suitable intervals on sections where vehicles travel fast (Enforcement Rule, Appendix 6, No. 110). It is not a regulatory sign banning traffic; when you see it, make a temporary stop before the crossing and check that it is safe before crossing (Road Traffic Act, Article 24, Paragraph 1). A point where vehicles and trams cross is shown by a different caution sign with a tram.
Legal basis: 도로교통법 시행규칙 별표6 110 철길건널목표지