their routes through East Boston and Revere, differing only on the northern end near Wonderland. They operate on 20-minute headways during peak hours, for an effective 10-minute combined headway on the shared segment on Meridian Street and Broadway. The May and November 2022 network plans proposed to discontinue route 117. The segment between Broadway and Wonderland station would become an extension of route at key bus route frequency. See also List of MBTA bus routes MBTA crosstown bus routes MBTA Silver Line (formerly considered part of the key routes) References External links MBTA - Key Bus Route Improvement Program MBTA Bus schedule and maps Review of MTBA bus routes Dropping Bus Service: An analysis of transit reliability in the Boston metro area MBTA bus routes MBTA bus routes MBTA MBTA