Minnesota constitution
Article XIV
Section 5

There is hereby created a highway user tax distribution fund to be used solely for highway purposes as specified in this article. The fund consists of the proceeds of any taxes authorized by sections 9 and 10 of this article. The net proceeds of the taxes shall be apportioned: 62 percent to the trunk highway fund; 29 percent to the county state-aid highway fund; nine percent to the municipal state-aid street fund. Five percent of the net proceeds of the highway user tax distribution fund may be set aside and apportioned by law to one or more of the three foregoing funds. The balance of the highway user tax distribution fund shall be transferred to the trunk highway fund, the county state-aid highway fund, and the municipal state-aid street fund in accordance with the percentages set forth in this section. No change in the apportionment of the five percent may be made within six years of the last previous change.