Ключевые слова: abstract, access, advisory, background, beware, blocked, broken, caution, cloud, clouds, color, conceptual, danger, dead, disrepair, editable, end, error, final, finish, grass, help, isolated, message, mistake, neglected, no, restricted, restriction, return, road, roadside, roadsign, safety, saftey, shape, sign, signage, signal, sky, stop, symbol, traffic, transportation, travel, warning, wrong,