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private roads; and <br />D. 23 feet above railroads. <br />The minimum obstruction clearance for licensing of a public airport requires <br />that no structure or mobile object, other than those necessary and incidental <br />to airport operations, and no trees shall penetrate the traverse way and the <br />approach surfaces described above. <br />D. Clear Zones <br />It is also required that "Clear Zones" at the ends of the runways be provided. <br />Runway Clear Zones are areas comprising the innermost portions of the runway <br />' <br />approach areas. The length of the clear zones in this case is the area lying <br />directly beneath the intermost 2000 feet of each approach surface. Like the <br />approach surface, the inner edge of the Clear Zone is the same width and <br />coincides with the end of the primary surface. From that 500 foot width at <br />the end of the primary surface, the Clear Zone widens symmetrically along <br />each side or outer edge at a rate of 20:3 until it reaches a total width <br />' <br />of 1100 feet at the end of the Clear Zone. <br />The airport is required to have an "adequate property interest" in the Clear <br />Zone area in order to prevent or eliminate airport obstructions and to prevent <br />' <br />future encroachments. Adequate property interest may be in the form of ownership <br />in fee simple, long term lease, or any other demonstration of legal ability <br />to prevent future obstructions in the runway Clear Zone. For the first 1000' <br />' <br />of the Clear Zone, fee title of the land is required; whereas, fee title to <br />9 <br />