What does the following safety sign mean?
A caution sign picture shows the cause of the danger directly (Enforcement Rule, Appendix 6). If you distinguish between something falling from above, the vehicle itself falling somewhere, and the vehicle skidding, you will not confuse the falling-rocks, drop-off and slippery-road signs.
Answer: ①
Explanation
A picture of a car falling off the edge of the road into water is a caution sign warning that one side of the road is a fall hazard such as a riverside, seaside, or valley (Enforcement Rule, Appendix 6, No. 127). It is placed on the right side of the road 30-200 meters before the hazard, and on a bicycle-only road the motor vehicle in the picture is replaced with a bicycle. Falling-rocks, bridge, and slippery-road signs have different pictures.
Legal basis: 도로교통법 시행규칙 별표6 127 강변도로표지