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tance of 4,000 feet as measured radially outward from the periphery <br />of the horizontal surface; <br />4. The approach surface is longitudinally centered on the extended <br />centerline at each end of the runway and it inclines upward and <br />outward at a slope of 40:1 for a horizontal distance of 10,000 <br />feet. The inner edge of the approach surface is the same width <br />and elevation as, and coincides with, the end of the primary <br />surface and it expands uniformly to a width of 3500' at the outer <br />edge;, <br />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. 15 feet above all other public roadways; <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 />6 <br />