The Good Roads Amendment of 1920

The Legislature shall make provision by law for a system of state roads and highways connecting at least the various county seats of the state, and to be under the control and supervision of such state officers and agencies as may be prescribed by law. The Legislature shall also provide a state revenue to build, construct, and maintain, or assist in building, constructing and maintaining the same and for that purpose shall have power to authorize the issuing and selling of state bonds, the aggregate outstanding amount of which, at any one time, shall not exceed fifty million dollars.
When a bond issue as aforesaid is authorized, the Legislature shall at the same time provide for the collection of an annual state tax sufficient to pay annually the interest on such debt, and the principal thereof within and not exceeding thirty years.