Ключевые слова: abstract, airport, autowalk, background, baggage, business, ceiling, center, concept, conveyor, corridor, disable, easy, elevation, elevator, entrance, escalator, food, horizontal, invalid, light, luggage, mall, mechanism, metal, mover, moving, need, pavement, people, safety, sidewalk, slippery, slow, speed, stable, stair, staircase, stairway, station, steel, store, supermarket, technology, terminal, travelator, travolator, underground, walkway, wheelchair,