the M is at 90 percent of the New York City Subway's capacity guidelines. Ridership on the M has been growing very rapidly since the 2010 service change, and this trend is expected to continue. In June 2016, the frequencies of service on the M route during peak hours were increased, with the expectation that peak train frequencies would be raised again in the future. From July 1, 2017 to April 30, 2018, reconstruction of two sections of the BMT Myrtle Avenue Line—the approaches to the line's junction with the BMT Jamaica Line and Fresh Pond Bridge over the Long Island Rail Road's Montauk Branch in Queens—required a reroute of M service. Trains to and from Manhattan and Queens, instead of going to Metropolitan Avenue, ran via the BMT Jamaica Line between Myrtle Avenue and Broadway Junction at all times except late nights, when service was suspended. A limited amount of rush hour trains ran between 71st Avenue in Queens and Second Avenue in Manhattan, replicating the train's routing prior to its discontinuation in 2010. Three shuttle bus routes ran during reconstruction of the Fresh Pond Bridge: one between Myrtle Avenue and Fresh Pond Road; the second between Myrtle and Metropolitan Avenues, skipping the Fresh Pond Road station during the daytime hours; and the third between Flushing Avenue/Broadway and Middle Village–Metropolitan Avenue, stopping at Flushing and Wyckoff Avenues for a transfer to the BMT Canarsie Line at Jefferson Street. When the Fresh Pond Bridge project was completed on September 2, 2017, two six-car shuttle trains began operating between Metropolitan and Wyckoff Avenues at all times, running separately from each other on each of the two tracks; two additional six-car trains were stored in the Fresh Pond Yard in order to swap consists in and out of service. These shuttles, along with a shuttle bus route that provided service between Wyckoff Avenue and Broadway, ran until April 27, 2018. When the 14th Street Tunnel shutdown started in April 2019, weekend and weekday evening M service (from 11:00 p.m. to 1:15 a.m.) was extended from Essex Street to 96th Street on the Second Avenue Subway in Manhattan, via 63rd Street, to compensate for limited L service between Brooklyn and Manhattan. The M had to run to 96th Street because of capacity reductions on the Queens Boulevard Line due to ongoing weekend construction. Both weekday and weekend M frequencies were also increased. This