Ключевые слова: aboveground, attraction, california, car, citizens, city, cityscape, commute, crossing, dark, downtown, electric, ground, imbedded, level, line, low, metro, motion, move, movement, night, progress, public, rail, railroad, rails, railway, road, san diego, shuttle, station, street, streetcar, tourism, tourist, track, traffic, train, tram, transit, transport, transportation, travel, trolley, urban, usa, vehicle, walking,