What does the following safety sign mean?
Bicycles and personal mobility devices must not ride two or more abreast on the roadway unless a safety sign allows it (Article 13-2(5) of the Road Traffic Act). Think about how the number and arrangement of bicycles drawn on this blue indication sign relate to that rule.
Answer: ④
Explanation
This sign, showing two bicycles riding side by side, allows two or more bicycles or personal mobility devices to ride side by side on a bicycle track (Enforcement Rule Annex 6, No. 333). Bicycles and personal mobility devices may not ride two or more abreast on the roadway unless a safety sign allows it (Road Traffic Act Article 13-2(5)), and this sign gives that permission. Being a blue circular indication sign, it does not prohibit anything.
Legal basis: 도로교통법 시행규칙 별표6 333 자전거 나란히 통행 허용표지