Ключевые слова: access, accessibility, antiterrorism, asphalt, barricade, barrier, border, bump, bumpy, closed, crosswalk, danger, diagonal, driveway, empty, equipment, hump, impediment, jump, line, metal, no entry, obstacle, obstruction, outdoors, parking, prevention, protection, red, risk, road, road closed, roadblock, roadway, row, security, sign, speed, stop, street, striped, surface, traffic, transportation, urban, warning, zebra,