Along with the boroughs and communities into which the city is divided, as mandated by law, there are also further subdivisions within the communities, each with its own name, but none with distinctly clear borders. They are called "Quartiere", which can be rendered as "quarters" or "neighbourhoods". Examples of these include the Unterstadt, the Oberstadt, Hammerhütte, Lindenberg, Charlottental, Haardter Berg (with the university) and the Alte Dreisbach. Some neighbourhoods even straddle community boundaries, like Sieghütte, parts of which can be found in both Siegen-Mitte and Weidenau. Moreover, some neighbourhoods even overlap each other. Unlike the boroughs ("Bezirke") or communities ("Ortsteile" and "Stadtteile"), the "Quartiere" have no statistical or administrative importance. They do, however, serve some function as to their inhabitants' identity, but more practically than that, they are also useful for finding one's way with a city map and using in bus route names and on public notices and traffic signs. Many of the "Hüttentalstraße" city Autobahn's exits are also named after the "Quartiere" that they serve.