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' The minimum obstruction clearance for licensing of a public airport requires that no structure or mobile object, other than those necessary and incidental to airport operations, and no trees shall penetrate the traverse way and the approach surfaces described above. ' D. Clear Zones ' It is also required that "Clear Zones" at the ends of the runways be pro- . vided. Runway Clear Zones are areas comprising the innermost portions of ' the runway approach areas. The length of the clear zones in this case is the area-lying directly beneath the innermost 2000 feet of each approach surface. Like the approach surface, the inner edge of the Clear Zone is ' the same width and coincides with the end of the primary surface. From that 500 foot width at the end of the primary surface, the Clear Zone widens symmetrically along each side or outer edge at a rate of 20:3 until it reaches a total width of 1100 feet at the end of the Clear Zone. ' The airport is required to have an "adequate property interest" in the Clear Zone area in order to prevent or eliminate airport obstructions and to prevent future encroachments. Adequate property interest may be in the form of ownership in fee simple, long term lease, or any other demonstra- ' tion of legal ability to prevent future obstructions in the runway Clear Zone. For the first 1000' of the Clear Zone, fee title of the land is 1 required; whereas, fee title to the land is desirable in the second 1000 feet, but ground easements may be allowable in certain areas. ' E. Land Use Zoning Requirements Land use safety zones are intended to restrict those uses which may be 7