Detroit Department of Transportation route 31 'Mack'
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|Communities Served||Detroit, Grosse Pointe Park, Grosse Pointe, Grosse Pointe Farms|
|Route Type||Key Route|
|Days of Operation||Daily|
|Vehicles Used||Gillig Low Floor, New Flyer Industries D40LF, New Flyer Industries XD40, New Flyer Industries XDE40, Proterra ZX5 40'|
|Average Daily Weekday Ridership (2014)||2,762|
31 Mack is a bus route operated by the Detroit Department of Transportation in Detroit, Michigan, United States.
- May 23, 2022 - Proterra ZX5 buses introduced to route, becoming the first bus route in Detroit to operate with battery-electric buses.