(1) "Expressways" or "major arterials" means those rights-of-way used primarily for fast or heavy traffic; and "collector streets" means those rights-of-way which have four lanes or more of moving traffic which carry traffic from local streets to the system of major arterials and highways and move traffic to parks, schools, and shopping centers serving residential neighborhoods.

(2) "Governing body" means a city council, a board of trustees of a town, or a board of county commissioners.

(3) "Planning commission" means the regional planning commission, county planning commission, district planning commission, or zoning commission, as the case may be, which has the responsibility of preparing plans for zoning or the making or adopting of plans for the physical development of the unincorporated and incorporated territory located within a distance of two miles from the perimeter of any telecommunications research facility of the United States.

(4) "Telecommunications research facility of the United States" means a site presently owned by the United States in this state consisting of not less than fifteen hundred contiguous acres in area and having located thereon technical electronic facilities of a value of more than five million dollars operated by an agency of the United States, and which technical electronic facilities are principally utilized in a program of scientific research in telecommunications and related atmospheric science, involving highly sensitive reception, observation, measurement, and recording of radio waves from distant emanation of experimental signals, radio astronomical sources, or electromagnetic phenomena of the atmosphere or ionosphere.