Broadway runs the length of Manhattan, being the only street running from almost the southern tip of the island, at Bowling Green, to the northern tip. South of Columbus Circle, it is a one-way street with all vehicle traffic traveling southbound. It crosses Spuyten Duyvil Creek via the Broadway Bridge and continues through the Bronx to Westchester County.
Broadway continues running through several Hudson River towns as U.S. Route 9, before becoming the "New York-Albany Post Road," and running through the state capital, Albany, terminating in Champlain, New York at the Canadian border. (Many towns along the way refer to the route as Broadway on their individual jurisdictions.) Diagonally crossing the Commissioners' Plan of 1811 of Manhattan streets, its intersections with avenues have been marked by "squares" (some merely triangular slivers of open space) and induced some interesting architecture, such as the famous Flatiron Building.