Ключевые слова: across, area, background, backgrounds, caution, city, cobblestone, concept, cross, crossing, crosswalk, danger, driveway, empty, gray, intersection, lane, oldtown, outdoor, paint, passage, pattern, pavement, pedestrian, people, porto, portugal, public, road, roadway, safety, sidewalk, sign, step, street, strip, striped, surface, symbol, town, traffic, urban, walk, walkway, way, white, zebra,