MBTA crosstown bus routes

The Massachusetts Bay Transportation Authority (MBTA) operates two specially designated crosstown bus routes in the Boston, Massachusetts, United States area, called CT2 and CT3, and intended as limited-stop buses connecting major points.

[1] Eight additional routes numbered CT4 through CT11 were proposed as part of an interim phase of the Urban Ring Project to provide circumferential service bypassing the crowded downtown subway stations, but were never put in service.

[1] The Crosstown Routes will be phased out by 2028, according to current MBTA bus network redesign plans.

[6][7] The CT3 Beth Israel Deaconess Hospital–Andrew Station (internally coded 708) connects the Longwood Medical Area to Andrew Square and runs entirely within the city of Boston.

The extension (internally coded 709) was dropped due to low ridership in March 2002.

[1] In January 2005, some rush hour service was rerouted to serve Newmarket Square.

[6][7] Media related to MBTA crosstown bus routes at Wikimedia Commons

Geographic map of MBTA crosstown bus routes as originally introduced. The CT1 is colored aqua, the CT2 navy, and the CT3 peach.
A southbound route CT1 bus at Central Square in August 2015
A route CT2 bus in Union Square in Somerville.
A Route CT2 bus with crosstown bus branding at Sullivan Square in 2007. These RTS buses have since been retired, and no current MBTA buses have crosstown bus branding.
A route CT3 bus on Brookline Avenue in September 2012