The Maryland Department of Transportation (MDOT) is a government agency in the U.S. state of Maryland. MDOT is overseen by Transportation Secretary John D. Porcari, whom had previously served as the Secretary prior to his current term, from 1999 to 2003. The agency is headquartered at 7201 Corporate Center Drive, which has a Hanover, Maryland address, in unincorporated Anne Arundel County.