sentences:  Streets on its southeast side are parallel or perpendicular to Market Street, while those on the northwest are nine degrees off from the cardinal directions.Market Street is a major transit artery for the city of San Francisco, and has carried in turn horse-drawn streetcars, cable cars, electric streetcars, electric trolleybuses, and diesel buses.Today Muni's buses, trolleybuses, and heritage streetcars (on the F Market line) share the street, while below the street the two-level Market Street subway carries Muni Metro and Bay Area Rapid Transit (BART).