Mo. Rev. Stat. § 142.009
If changes made in the renewal of the Federal Surface Transportation Act due to expire in 1997 are such that Missouri will not need the full six-cent fuel tax increase provided in section 142.803, and section 226.200, to match federal funds available to Missouri, or if in the opinion of the general assembly revenues generated by section 142.803, and section 226.200, are not being used for the purposes outlined in the fifteen-year road and bridge program as adopted by the Missouri transportation department on January 6, 1992, or for any other reason, the general assembly may by a constitutional majority vote to place before the voters the issue of whether the increases in tax scheduled for April 1, 1994, and April 1, 1996, as specified in section 142.803, shall be implemented or shall be repealed.
§ 142.009, RSMo
Effective 1/1/1999