Miss. Code Ann. § 65-9-30: Miss. Code Ann. § 65-9-30

(1) The State Aid Engineer shall maintain an accurate record of all federal aid secondary funds, federal “safer off-system” funds, and all other available federal road funds allocated to the counties in accordance with the percentages set out in Section 65-9-3 . He shall likewise maintain an accurate account of all state aid funds apportioned to the counties in accordance with the percentages and provisions set out in Section 27-65-75 .

(2) The State Aid Engineer is hereby authorized to utilize state aid funds, and federal aid secondary funds allocated to the counties as provided for in accordance with Section 65-9-29 , and federal “safer off-system” funds, and/or any other available federal road funds allocated to Mississippi and to be expended on county roads, and allocated to the counties as provided for in accordance with Section 65-9-29, in such amounts as he deems necessary for an orderly and effective programming of all funds available to the counties, including an interchange of one (1) type of funds for another type of funds when necessary; provided, however, that each county shall receive, not less than annually, its pro rata share of the combined funds so allocated; and further provided that the authority of the county boards of supervisors to otherwise adopt construction programs is in no way circumvented.