Section 24-1-102 - Location, survey and construction(a) Any such highways, and such additional highways in connection therewith as may be provided for, which are designated as state highways, shall be located and surveyed under the direction and supervision of the director of the department of transportation or his authorized representative, who shall cause plans and specifications of the highways to be prepared, and designate the materials to be used in their construction. He shall take into consideration the climate, soil and materials to be had in the vicinity, and the extent and nature of the probable traffic on the highway with a view to the most economical construction consistent with efficiency. (b) Where any such highways are designated as a county highway the same shall be located and surveyed under the direction of the county surveyor of the county in which such highway is located; said county surveyor shall cause plans and specifications of any such highway to be prepared and the board of county commissioners of such county shall designate the materials to be used in their construction. Said board of county commissioners shall take into consideration the climate, soil, and materials to be had in the vicinity, and the extent and nature of the probable traffic on said highway with a view to the most economical construction thereof consistent with efficiency. The expense of locating, surveying, and constructing such county highways shall be paid by the county in which such highway is constructed.