Indiana Code Title 8. Utilities and Transportation § 8-17-5-6

(1) Prepare and publish a county-wide inventory and classification of the county highway system so that the total county federal aid secondary system is included in the county primary or arterial system of roads.

(2) Prepare and keep a perpetual inventory of all bridges and culverts serving the county highway system.  The inventory must show the location, dimensions, condition, and the year of construction for all bridges and major culverts.

(3) Prepare and publish standards of design, construction, and maintenance of the county arterial, feeder, and local roads that make the best and most economical use of local road materials.

(4) Prepare a long-range county-wide program of road and bridge construction and improvements, with the proposed projects arranged in order of priority.  The program of proposed projects must cover a period of at least four (4) years.

(5) Investigate requests and petitions for road or bridge improvements that are received either by the county executive or at public hearings, and make recommendations to the county executive.

(6) Prepare surveys, designs, plans, and specifications for all county road and bridge construction projects, prepare contracts, and advertise for bids.

(7) Make construction and materials inspection of all county road and bridge construction projects, inform the executive of the status of construction work, and certify completed construction projects.

(8) Develop a county-wide program of traffic safety that provides for traffic control signs, signals, and speed limits, warning protection at railroad crossings, load limits, and detour routings.

(9) Inspect and approve the construction of subdivision streets that are to be taken into the county highway system, and recommend appropriate action to the executive when roads and streets in subdivisions are being taken into the county highway system.

(10) Prepare engineering estimates and make recommendations to the executive concerning the materials and equipment needed in the annual budgeting of both construction and maintenance funds.