Belgrade is a separate territorial unit in Serbia, with its own autonomous city authority. The Assembly of the City of Belgrade has 110 members, elected on four-year terms. A 13-member City Council, elected by the Assembly and presided over by the mayor and his deputy, has the control and supervision of the city administration, which manages day-to-day administrative affairs. It is divided into 14 Secretariats, each having a specific portfolio such as traffic or health care, and several professional services, agencies and institutes.