Ключевые слова: background, barricade, barrier, barriers, block, blocking, boundary, built, cement, city, close, concrete, construction, danger, dirty, edge, form, ground, hard, highway, industry, isolated, line, no, object, objects, old, prevent, progress, protection, red, road, rough, safety, security, sign, site, stop, street, stripe, structure, texture, traffic, urban, wall, warning, white, work,