What does the following safety sign mean?
💡 Hint
A blue circle is an indication sign, a circle with a red border is a regulatory sign, and a triangle with a red border is a caution sign (Annex 6 of the Enforcement Rule). Even if the arrows look similar, the shape and color of the sign decide whether it means 'do this', 'prohibited', or 'be careful'.
Answer: ②
Explanation
This indication sign has a white arrow turning left on a blue circle and instructs vehicles to turn left (Enforcement Rule Annex 6, No. 307). A no-left-turn sign is a regulatory sign with a red border, and a left-curve warning is a triangular caution sign, so their shapes differ. The U-turn sign has a U-shaped arrow that comes back down.
Legal basis: 도로교통법 시행규칙 별표6 307 좌회전표지