The Martin Luther King Jr. Highway Line, designated Route A12 is a daily bus route operated by the Washington Metropolitan Area Transit Authority between Addison Road station of the Blue and Silver Lines of the Washington Metro and Capital Plaza Mall. The line operates every 20 minutes between 7AM and 9PM, 30 minutes after 9PM weekdays and 60 minutes after 9PM weekends. Route A12 trips roughly take 55 minutes. On Sundays, Route A12 is extended to Capitol Heights station replacing a portion of route F14.