A 2021 NovaBusLFS HEV (9635) on the Yorkville-bound M31 in June 2024
For most of its length, the M31 uses 57th Street to travel crosstown, then uses York Avenue to travel uptown to 92nd Street and First Avenue.[1][6] At its western end, the M31 turns left on Eleventh Avenue, then left on 54th Street to terminate; eastbound buses return to 57th Street using Tenth Avenue.[1][6] At its northern/eastern end, the M31 goes left on 91st Street then right on First Avenue, terminating along 92nd Street before returning southbound on York Avenue.[6] During morning rush hours, one articulated bus runs on the M31.
The M57 mostly duplicates the M31 along 57th Street.[2][6] The only major difference is that the M57 uses West End Avenue to reach its western terminus at 72nd Street and Amsterdam Avenue. At its eastern end, the M57 reaches First Avenue, eastbound buses turn on 1st, then terminate. Westbound buses then use Sutton Place, 55th Street, and First Avenue to access 57th Street, where they turn back crosstown.[6]
The route, formerly numbered M20, became M28 on July 1, 1974, as part of the renumbering of bus routes in Manhattan.[10][7][8]
On September 10, 1989, the M28 (57th Street Crosstown) and M103 (59th/60th Street Crosstown) routes were merged to form the M57. M57 buses began operating from 57th Street and Sutton Place South to Broadway and 72nd Street, running via 57th Street and West End Avenue.[11]
A 2010 Orion VII NG HEV (4662) on the Yorkville-bound M31, and in August 2018, a 2006 OrionVII OG HEV (6736) at 57th St-7th Ave on the Upper West Side-bound M57.
1 2 "Historical Maps". www.nycsubway.org – 1974 Manhattan bus guide – Part 1: The Whole Map. 1974. Archived from the original on August 17, 2016. Retrieved September 22, 2016.
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