1904, the station underneath was largely complete, and service on the subway line began on October 27, 1904. The station only served local trains; express trains bypassed the station. The platforms of the IRT subway station were lengthened in 1957–1959, requiring further excavations around Columbus Circle. An additional subway line—the Independent Subway System (IND)'s Eighth Avenue Line, serving the present-day —was built starting in 1925. At Columbus Circle, workers had to be careful to not disrupt the existing IRT Broadway–Seventh Avenue Line or Columbus Circle overhead. The Columbus monument was shored up during construction, and obstructions to traffic were minimized. The line, which opened in 1932, contains a 4-track, 3-platform express station at 59th Street–Columbus Circle, underneath the original IRT station. The IND station were designed as a single transit hub under Columbus Circle. Eno's traffic plan In November 1904, due to the high speeds of cars passing through the circle, the New York City Police Department added tightly spaced electric lights on the inner side of the circle, surrounding the column. The current circle was redesigned in 1905 by William Phelps Eno, a businessman who pioneered many early innovations in road safety and traffic control. In a 1920 book, Eno writes that prior to the implementation of his plan, traffic went around the circle in both directions, causing accidents almost daily. The 1905 plan, which he regarded as temporary, created a counterclockwise traffic pattern with a "safety zone" in the center of the circle for cars stopping; however, the circle was too narrow for the normal flow of traffic. Eno also wrote of a permanent plan, with the safety zones on the outside as well as clearly delineated pedestrian crossings. The redesign marked the first true one-way traffic circle to be constructed anywhere, implementing the ideas of Eugène Hénard. In this second scheme, the public space within the circle, around the monument, was almost as small as the monument's base. The rotary traffic plan was not successful. A New York Times article in June 1929 stated that the "Christopher Columbus [monument] is safe and serene, but he's the only thing in the Circle that is." At the time, there were eight entrance and exit points to Columbus Circle: two each from 59th Street/Central Park South, to the west and east; Broadway, to the northwest and southeast; Eighth Avenue/Central Park West, to the south and north; and within Central Park