The MWAA Police Department does much more than patrol the airport terminals and grounds. Authority Police also provide primary law enforcement to the buildings and properties surrounding Ronald Reagan Washington National and Dulles International Airports and patrol the Dulles Access Road and the Dulles Toll Road. These  are the roads which provide express  travel from I-495 and to I-66 to Dulles International Airport.

The Dulles Access Highway was built to serve Dulles Airport users and, by federal law and Authority regulation, is restricted to airport users (as stated in Metropolitan Washington Airports Regulations, §4.2). The Dulles Access Highway is Authority property, and the Authority Police have primary police jurisdiction along with the Virginia State Police and the Fairfax County Police.