What is the most appropriate way to drive when you see this sign?
When you see a caution sign, the basic response is to slow down before reaching that point (Enforcement Rule, Appendix 6). Check how many bumps are drawn on the road surface, and remember that if the crosswalk is raised you also need to watch for pedestrians.
Answer: ②
Explanation
A picture of a single round hump rising from the road surface is a caution sign warning of a speed bump, a raised crosswalk (a crosswalk built slightly higher than the surrounding lanes), or a raised intersection (Enforcement Rule, Appendix 6, No. 129). It is placed on the right side of the road 30-200 meters before that point, so slow down in advance to go over it and watch for pedestrians at a raised crosswalk. Tunnel, bridge, and uphill signs have different pictures, and the options that involve accelerating are dangerous in themselves.
Legal basis: 도로교통법 시행규칙 별표6 129 과속방지턱, 고원식 횡단보도, 고원식 교차로표지