The Washington Post reports that members of the Teamster-affiliated D.C. Taxi Operators Association made their way from East Potomac Park to arrive at Freedom Plaza late this morning to deliver a letter and petition to city officials. The drivers are calling for officials to impose a cease and desist order on the services, arguing that the companies are at an unfair advantage because they are not subject to the same strict regulations and fee requirements as regular cab operators. Similar protests have taken place recently in other U.S. cities and around the world.