Ключевые слова: back, background, board, caution, concept, course, danger, direction, driver, english, enter, entry, go, highway, illustration, incorrect, information, isolated, label, law, message, metal, not, object, outdoor, pole, post, print, red, road, roadsign, safety, security, sign, signaling, stop, street, symbol, text, traffic, transportation, travel, united states of america, usa, warning, way, white, wrong, wrong way,