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5. The transitional surface extends upward and outward at right angles <br />to the runway centerline and the runway centerline extended at a <br />slope of 7:1 from the sides of the primary surfaces and from the <br />sides of the approach surfaces until they intersect the horizontal <br />surface or the conical surface. <br />In addition, the following minimum clearances above traverse ways shall <br />be provided to prevent temporary, mobile obstructions to the above-defined <br />surfaces: <br /> 1. 17 feet above interstate highways; <br />' 2 s <br />ublic roadwa <br />15 feet above all other <br /> . ; <br />y <br />p <br /> 3. 10 feet or the height of the highest mobile object that would <br /> normally traverse the road, whichever is greater, above pri- <br />' vate roads; and <br /> 4. 23 feet above railroads. <br /> <br />' The mini mum obstruction clearance for licensing of a public airport requires <br /> that no structure or mobile object, other than those necessary and incidental <br />' to airpo rt operations, and no trees shall penetrate the traverse way and the <br /> approach surfaces described above. <br /> <br />' D. Clear Zones <br />It is also required that "Clear Zones" at the ends of the runways be pro- <br />, vided. Runway Clear Zones are areas comprising the innermost portions of <br />the runway approach areas. The length of the clear zones in this case is <br />the area lying directly beneath the innermost 2000 feet of each approach <br />surface. Like the approach surface, the inner edge of the Clear Zone is <br />7 <br />