A sidewalk is a pedestrian path along the side of a road. A sidewalk may accommodate moderate changes in grade (height) and is normally separated from the vehicular section by a curbThere may also be a strip of vegetation, grass or bushes or trees or a combination of these between the pedestrian section and the vehicular section.(http://en.wikipedia.org/wiki/Sidewalk)
The sidewalk, severs far more purposes besides carrying pedestrian. It acts as the onjunction of the buildings and other users that border it. It provides a place that people could participate into the city life. Nowadays, a csidewalk by itself is nothing. It may be used for rich social spaces ground retail, markets by busking musicians or bicycles.
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