Ключевые слова: 50, alert, background, black, blue, board, color, curve, end, forest, grass, green, green city, green environment, info, information, law, limit, markings, maximum, metal, nature, number, pedestrian, people, polarized, post, precaution, red, road, round sign, safe, safety, shape, sign, signage, sky, slow speed, slower, speed, speed limit, street, summer, sunny, town, traffic, transport, travel, warning, zone,