1. The state highways and transportation commission of Missouri is authorized and directed to purchase a surety bond or bonds to guarantee to the state highways and transportation commission of Missouri the payment of any funds which have been or may be hereafter advanced or furnished to the state highways and transportation commission as trustee by any county, civil subdivision or interested parties for the purpose of making secure contributions toward the cost of constructing any road or bridge now being constructed or hereafter to be constructed under the supervision and direction of the state highways and transportation commission of Missouri as part of the state highway system, and which moneys have been or may be deposited in the various banks or trust companies throughout the state to the credit of the state highways and transportation commission of Missouri as trustee.

2. The premium on said bond or bonds shall be paid by the county, civil subdivision or interested parties or the various banks or trust companies which are depositaries of said funds, and in the event a blanket bond is secured the amount of the premium which each bank or trust company having any of said funds on deposit shall be required to pay shall be determined by the percentage of such trust funds deposited in said bank or trust company; provided, any bank may deposit bonds as security for said money on deposit, such bonds to be approved by the state transportation department.