Establishment and maintenance of limited-access roads. Acquisition of property and property rights. Design of limited-access roads. Designation of limited-access roads; elimination of intersections at grade. Conducting commercial enterprises or activities on property on which limited-access roads have been constructed. Installation and operation of vending machines in safety rest areas on rights of way of state highway system. Lease of air rights. Establishment, maintenance, and disposal of local service roads. Effect of article on Coastal Highway District and Coastal Scenic Highway Authority. PART 2 SUBDIVISIONS 32-6-150.