31-6-1 Cooperation of department in federal construction program. 31-6-2 Cooperation of department in selection of system. 31-6-3 Resolution of county proposing project--Preliminary survey, plans, and estimates. 31-6-4 Federal approval of project--Call for bids by department--Contract not let until payment provided by county. 31-6-5 Jurisdiction of highway on which project approved or constructed. 31-6-6 Nonliability of state for project--Department reimbursed by county. 31-6-7 Responsibility for maintenance. 31-6-8 Allocation of federal funds for construction of roads requested by commissioners. 31-6-9 Transportation Commission to match funds.