Mass Transit The mission of Mass Transit Administration (MTA) of the District Department of Transportation (DDOT) is to provide the public with efficient, affordable and diverse means of travel within the District of Columbia by providing funding, policy recommendations and coordination services to the Washington Metropolitan Area Transit Authority (WMATA). Transit Services Special Programs State Safety Oversight  Events & Newsletters Current Projects Completed Studies * This document is presented in Portable Document Format (PDF). A PDF reader is required for viewing. Download a PDF Reader or Learn More About PDFs.