Minnesota constitution
Article XIV
Section 2

Any route added by the legislature to the trunk highway system may be relocated or removed from the system as provided by law. The definite location of trunk highways numbered 1 through 70 may be relocated as provided by law but no relocation shall cause a deviation from the starting points or terminals nor cause any deviation from the various villages and cities through which the routes are to pass under the constitutional amendment adopted November 2, 1920. The location of routes may be determined by boards, officers or tribunals in the manner prescribed by law.