and 59th Street. The 63rd Street lines () pass underneath without stopping, and the line contains a single ventilation shaft within the park, west of Fifth Avenue and 63rd Street. Various bus routes pass through Central Park or stop along its boundaries. The M10 bus stops along Central Park West, while the M5 and part of the M7 runs along Central Park South, and the run along Central Park North. The M1, M2, M3, and M4 run southbound along Fifth Avenue with corresponding northbound bus service on Madison Avenue. The (Select Bus Service), buses use the transverse roads across Central Park. The only serve Columbus Circle on the south end of the park, and the run on 57th Street two blocks from the park's south end but do not stop on the boundaries of the park. Some of the buses running on the edge of Central Park replaced former streetcar routes that formerly traveled across Manhattan. These streetcar routes included the Sixth Avenue line, which became the M5 bus, and the Eighth Avenue line, which became the M10. Only one streetcar line traversed Central Park: the 86th Street Crosstown Line, the predecessor to the M86 bus. Transverse roads Central Park contains four transverse roadways that carry crosstown traffic across the park. From south to north, they are at 66th Street, 79th Street, 86th Street, and 97th Street; the transverse roads were originally numbered sequentially in that order. The 66th Street transverse connects the discontinuous sections of 65th and 66th streets on either side of the park. The 97th Street transverse likewise joins the disconnected segments of 96th and 97th streets. The 79th Street transverse links West 81st and East 79th streets, while the 86th Street transverse links West 86th Street with East 84th and 85th streets. Each roadway carries two lanes, one in each direction, and is sunken below the level of the rest of the park to minimize the transverses' visual impact on it. The transverse roadways are open even when the park is closed. The 66th Street transverse was the first to be finished, having opened in December 1859. The 79th Street transverse—which passed under Vista Rock, Central Park's second-highest point—was completed by a railroad contractor because of their experience in drilling through hard rock; it opened in December 1860. The 86th and 97th Street transverses opened in late 1862. By the 1890s, maintenance had decreased to the