What does the following safety sign mean?
The picture inside a triangular caution sign shows what will appear ahead (Enforcement Rule, Appendix 6). Tell whether the vehicle on the rails is a steam locomotive or a tram, and remember that prohibitions use round red signs and instructions use round blue signs.
Answer: ②
Explanation
A triangular sign with a tram running on rails is a caution sign warning of a point where vehicles and trams cross (Enforcement Rule, Appendix 6, No. 110-2). It is placed in the middle or on the right side of the road 50-120 meters before the crossing point, so slow down and check for approaching trams. A railroad crossing shows a steam locomotive, and the no-buses sign (red circle) and the exclusive bus lane sign (blue indication sign) differ in shape altogether.
Legal basis: 도로교통법 시행규칙 별표6 110의2 노면전차주의표지