The property and equipment delivered to the county superintendent of highways in conjunction with the establishment of a county unit road district shall be appraised and its fair value determined by the county superintendent of highways and the highway commissioner of the former district. Disputes as to the value of transferred property shall be arbitrated by qualified appraisers approved by both the district highway commissioner and the county superintendent of highways. Such property and equipment may be retained and used by the county or may be disposed of and sold, with the funds so derived deposited in the county unit district account, as the county board may determine. In case a road district has outstanding road bonds or road improvement bonds, an amount equal to the appraised or sale value of such property and equipment, less the amount of any indebtedness of the former district assumed by the county unit road district, shall be set up to the credit of such road district by the county treasurer from any funds available therefor and shall be used to pay the principal and interest on such bonds, to the extent such credit may be available, and the tax levied for the payment of the principal and interest upon such road bonds or road improvement bonds shall be abated by the amount so applied. In case the road district had no such bonds or road improvement bonds outstanding, an amount equal to the appraised or sale value of such property and equipment, less the amount of any indebtedness of the former district assumed by the county unit road district, shall be used for the maintenance, repair and improvement of roads in the particular area that was included in such former district, as the funds become available therefor but without sacrificing normal necessary roadwork in any other area.