It was shared with bicycles until late summer 2004, when a dedicated bicycle path was opened on the north side of the bridge. The northern bridge bike path is notable for poor signage that leads to cyclist and pedestrian conflicts. By the time work on the bridge was completed in 2004, the final cost of the renovation totaled $800 million. To celebrate the bridge's centennial anniversary, a series of events and exhibits were organized by the New York City Bridge Centennial Commission in October 2009. These included a ceremonial parade across the Manhattan Bridge on the morning of October 4 and a fireworks display in the evening. In 2009, the bridge was designated as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers. The bridge has four vehicle lanes on the upper level, split between two roadways carrying opposite directions of traffic. The lower level has three Manhattan-bound (formerly reversible) vehicle lanes, four subway tracks, a walkway and a bikeway. The bridge once carried New York State Route 27 and later was planned to carry Interstate 478. The bridge is the subject of American artist Edward Hopper's famous painting "Manhattan Bridge Loop". In 1910, after the bridge opened, the architectural firm Carrère and Hastings drew up preliminary plans for an elaborate Greek Revival grand entry to the bridge on the Manhattan side, as part of the "City Beautiful" movement. Construction began that year, and plans were finalized in 1912. It was described as a "complete, dignified and monumental ensemble, worthy of one of the principal gateways of a great modern city" in a "New York Times" article. The arch and colonnade were completed in 1915. The decoration includes pylons which were sculpted by Carl Augustus Heber and a frieze called "Buffalo Hunt" by Charles Rumsey. The arch and colonnade were designated a New York City landmark on November 25, 1975. After many years of neglect and several attempts by traffic engineers to remove the structure, the arch and colonnade were repaired and restored in 2000. Four subway tracks are located on the lower deck of the bridge, two on each side of the roadway. The two tracks on the south side are used by the train at all times and the train at all times except late nights, when they use the Montague Street Tunnel. The tracks on the north side are used by the train at all times and the train on weekdays. On the Manhattan side, the south side tracks connect to Canal Street and become the express tracks of the BMT Broadway Line, while the north side tracks connect to the Chrystie Street Connection through Grand Street and become the express tracks on the IND Sixth Avenue Line.