Houston Are Worst|publisher=Bicycling|date=January 26, 2006|url=http://www.bikechattanooga.org/BicyclingMagazineRecognizesChattanoogainTop21Cities.html|accessdate=April 22, 2009 Category: File - :OverCoronadoSanDiegoAug07.jpg|thumb|right|260px|View of Coronado and San Diego from the air San Diego is served by the trolley , bus , Sprinter , Coaster , and Amtrak . The trolley primarily serves downtown and surrounding urban communities, Mission Valley , east county, and