생김새
A round yellow disc, the only round warning sign, with a black X and the letters R R marking a railroad crossing ahead.
언제 보게 되나요
In advance of a railroad crossing on both highways and city streets, giving drivers time before they reach the tracks.
무엇을 해야 하나요
Slow down and be prepared to stop; look and listen for trains, and never start across unless you can clear the tracks completely.
출처: 통일 교통 통제 시설 매뉴얼(MUTCD) 제11판 — 미국 연방도로청(FHWA).
