Ключевые слова: accident, asphalt, black, broken, cement, city, concept, concrete, cone, construction, cover, crack, damaged, danger, dangerous, drain, drainage, floor, gray, grey, ground, hole, holes, industrial, manhole, material, object, old, pavement, road, rough, safety, sewage, sewer, sign, street, surface, traffic, transportation, underground, urban, walk, white, work,