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The agency's history can be traced to the state's Railroad and Warehouse Commission which emerged slowly from 1871 to 1905, and the State Highway Commission created in 1905. The Highway Commission was abolished in 1917 and replaced by a Department of Highways. The Minnesota Highway Department has been credited with numerous works listed on the U.S. National Register of Historic Places. For air transport, the Minnesota Aeronautics Commission was created in 1933. Much of the railroad oversight was transferred to the Minnesota Department of Public Service in 1967. Two years later, the Minnesota Department of Public Safety was established and took over the Highway Patrol and Driver's License Bureau. MnDOT finally came into being in 1976 and took over the functions of the aeronautics and highway departments, plus transportation-related duties of the Minnesota State Planning Agency and Department of Public Service. Services and projects MnDOT operates networks of ramp meters and traffic cameras in the Minneapolis-St. Paul metropolitan area in order to manage traffic flow. The department has also put up informational electronic signage along highways to provide alert messages. Message boards have been in Rochester, Duluth and the Twin Cities for some time. Part of the reason for the Rochester signs is occasional flooding of U.S. Highway 52. The department expanded use of the signs after Amber Alert legislation allocated funding for larger networks. In the Twin Cities, MnDOT began using them to display freeway travel times in 2003 or 2004 to help drivers plan alternate routes to avoid heavy traffic if necessary (although a generic m