Minnesota constitution
Article XIV
Section 8

There is hereby created a municipal state-aid street fund to be apportioned as provided by law among municipalities having a population of 5,000 or more. The fund shall be used by municipalities as provided by law for the construction, improvement and maintenance of municipal state-aid streets. The legislature may authorize municipalities to use a part of the fund in the construction, improvement and maintenance of other municipal streets, trunk highways, and county state-aid highways within the counties in which the municipality is located.