The Halifax-Dartmouth Bridge Commission, operating as Halifax Harbour Bridges, is a Nova Scotia Crown corporation created in 1950 by provincial statute. It currently operates under a new statute passed in 2005 named the Halifax-Dartmouth Bridge Commission Act. The commission is responsible for constructing, operating, and maintaining two suspension bridges that cross Halifax Harbour between the communities of Halifax and Dartmouth. The commission also maintains authority over any other bridge or tunnel structures crossing the harbour limits, including the Northwest Arm, although no such bridge or tunnel currently exists.