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Streets also tend to aggregate establishments of similar nature and character. East 9th Street in Manhattan, for example, offers a cluster of Japanese restaurants, clothing stores, and cultural venues. In Washington, D.C., 17th Street and P Street are well-known as epicenters of the city's (relatively small) gay culture. Many cities have a Radio Row or Restaurant Row. Like in Philadelphia there is a small street called Jewelers' row giving the identity of a "Diamond district". This phenomenon is the subject of urban location theory in economics.
As distinct from other spaces
A road, like a street, is often paved and used for travel. However, a street is characterized by the degree and quality of street life it facilitates, whereas a road serves primarily as a through passage for road vehicles or (less frequently) pedestrians. Buskers, beggars, boulevardiers, patrons of pavement cafés, peoplewatchers, streetwalkers, and a diversity of other characters are habitual users of a street; the same people would not typically be found on a road.