Broadway once was a two-way street for its entire length. The present status, in which it runs one-way southbound south of Columbus Circle (59th Street), came about in several stages. On June 6, 1954, Seventh Avenue became southbound and Eighth Avenue became northbound south of Broadway. None of Broadway became one-way, but the increased southbound traffic between Columbus Circle (Eighth Avenue) and Times Square (Seventh Avenue) caused the city to re-stripe that section of Broadway for four southbound and two northbound lanes. Broadway became one-way from Columbus Circle south to Herald Square (34th Street) on March 10, 1957, in conjunction with Sixth Avenue becoming one-way from Herald Square north to 59th Street and Seventh Avenue becoming one-way from 59th Street south to Times Square (where it crosses Broadway). On June 3, 1962, Broadway became one-way south of Canal Street, with Trinity Place and Church Street carrying northbound traffic.
Another change was made on November 10, 1963, when Broadway became one-way southbound from Herald Square to Madison Square (23rd Street) and Union Square (14th Street) to Canal Street, and two routes – Sixth Avenue south of Herald Square and Centre Street, Lafayette Street, and Fourth Avenue south of Union Square – became one-way northbound. Finally, at the same time as Madison Avenue became one-way northbound and Fifth Avenue became one-way southbound, Broadway was made one-way southbound between Madison Square (where Fifth Avenue crosses) and Union Square on January 14, 1966, completing its conversion south of Columbus Circle.
In 2001, a one-block section of Broadway between 72nd Street and 73rd Street at Verdi Square was reconfigured. Its easternmost lanes, which formerly hosted northbound traffic, were turned into a public park when a new subway entrance for the 72nd Street station was built in the exact location of these lanes. Northbound traffic on Broadway is now channeled onto Amsterdam Avenue to 73rd Street, makes a left turn on the three-lane 73rd Street, and then a right turn on Broadway shortly afterward. In August 2008, two traffic lanes from 42nd to 35th Streets were taken out of service and converted to public plazas. Additionally, bike lanes were added on Broadway from 42nd Street down to Union Square.
Since May 2009, the portions of Broadway through Duffy Square, Times Square, and Herald Square have been closed entirely to automobile traffic, except for cross traffic on the Streets and Avenues, as part of a traffic and pedestrianization experiment, with the pavement reserved exclusively for walkers, cyclists, and those lounging in temporary seating placed by the city. The city decided that the experiment was successful and decided to make the change permanent in February 2010. Though the anticipated benefits to traffic flow were not as large as hoped, pedestrian injuries dropped dramatically and foot traffic increased in the designated areas; the project was popular with both residents and businesses. The current portions converted into pedestrian plazas are between West 47th Street and West 42nd Street within Times and Duffy Squares, and between West 35th Street and West 33rd Street in the Herald Square area. Additionally, portions of Broadway in the Madison Square and Union Square have been dramatically narrowed, allowing ample pedestrian plazas to exist along the side of the road. In May 2013, the NYCDOT decided to redesign Broadway between 35th and 42nd Streets for the second time in five years, owing to poor connections between pedestrian plazas and decreased vehicular traffic. With the new redesign, the bike lane is now on the right side of the street; it was formerly on the left side adjacent to the pedestrian plazas, causing conflicts between pedestrian and bicycle traffic. In spring 2017, as part of a capital reconstruction of Worth Square, Broadway between 24th and 25th Street was converted to a “shared street” where through vehicles are banned and delivery vehicles are restricted to 5 miles per hour (8.0 km/h). Delivery vehicles go northbound from Fifth Avenue to 25th Street for that one block, reversing the direction of traffic and preventing vehicles from going south on Broadway south of 25th Street. The capital project expands on a 2008 initiative where part of the intersection of Broadway and Fifth Avenue was repurposed into a public plaza, simplifying that intersection. As part of the 2017 project, Worth Square was expanded, converting the adjoining block of Broadway into a “shared street.”
