Ключевые слова: absract, abstract, american, angle, background, black, caution, color, copy, day, drive, driving, fifty, five, highway, hour, isolated, law, limit, limited, maximum, metal, number, per, perspective, pole, post, reflective, regulation, regulations, regulatory, restrictive, road, roadsign, rules, school, sign, sky, space, speed, start, street, sunny, text, traffic, transportation, usa, warning, white, zone,