Signing Plan Legal Authority

Minnesota Statutes, section 169.06, subdivision 2, Signals, Markings: Placement and Maintenance on Trunk Highway
Minnesota Statutes, section 160.292, Information Signs for Specific Services, Definitions
Minnesota Statutes, section 160.80, Sign Franchise Program
Minnesota Statutes, section 161.14, Names and Designations of Certain Highways
Minnesota Statutes, section 161.139, Highway Designation Costs
Traffic Engineering Manual, Chapter 2 contains other laws related to signing.