What does the following safety sign mean?
💡 Hint
A white arrow inside a blue circle is an indication sign telling you to proceed in that direction (Annex 6 of the Enforcement Rule). Even with the same arrow, a red border makes it a regulatory sign that prohibits, so use the color and border first to tell 'do this' from 'do not do this'.
Answer: ①
Explanation
This indication sign has a single white arrow pointing up on a blue circle and instructs vehicles to go straight (Enforcement Rule Annex 6, No. 305). It is installed on the right side of the road where vehicles are to go straight. A sign prohibiting going straight is a regulatory sign with a red border and has the opposite meaning.
Legal basis: 도로교통법 시행규칙 별표6 305 직진표지