Two main public bus systems operate in Washington, D.C. Metrobus, operated by the Washington Metropolitan Area Transit Authority (WMATA), is the primary public bus system in Washington, D.C. Serving more than 400,000 riders each weekday, it is one of the nation's largest bus systems by annual ridership. The city also operates its own DC Circulator bus system, which connects commercial and touristic areas within central Washington. The DC Circulator costs only $1 to ride and is composed of six distinct routes that cover central D.C. and suburban Rosslyn, Virginia. The DC Circulator is run via a public-private partnership between the District of Columbia Department of Transportation, WMATA, and DC Surface Transit, Inc. (DCST). The bus system services each stop approximately every 10 minutes.