Taxi is one kind of companion for Americans. People are busy in their daily life, and they are saving time by taking taxi except public transportation. On the other hand, a lot of immigrant became taxi driver because they didn't get a good job. So, I think Taxi is a big symbol in American culture. I add a link bellow which give you some ideas about NYC Taxi: http://www.google.com/images?hl=en&source=hp&biw=1280&bih=709&q=The+NYC+taxi&btnG=Search+Images&gbv=2&aq=f&aqi=&aql=&oq=

