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-- <br />5-502 M. Sight Distance <br />The following table establishes minimum required <br />stopping sight distance and passing site distance. <br />Criteria for measuring sight distance, both vertical <br />and horizontal, are: <br />I. For stopping sight distance, height of eye, 3.75 <br />feet, and height of object, 0.5 feet; for passing <br />sight distance, height of eye, 3.75 feet, and <br />height of object, 4.5 feet. <br />Design Soeed. moh (15-20) 30 40 50 <br />Stonoina Sight Distance <br />Minimum Stopping Sight Distance, feet <br />K value for:* <br />Crest vertical curve <br />Sag vertical curve <br />Desirable Stopping Sight <br />K value for:* <br />Crest vertical curve <br />Sag vertical curve <br />Passing Sight Distance <br />Passing distance, feet <br />2-lane <br />K-value for: <br />Crest vertical curve <br />Distance, feet <br />150 200 275 350 <br />16 28 55 85 <br />24 35 55 75 <br />150 200 300 450 <br />16 28 65 14=• <br />24 35 60 l0U <br />1100 1500 1800 <br />365 686 985 <br />K value is a coefficient by which the algebraic differences in grade may be <br />multiplied to determine the length in feet of the vertical curve which will <br />provide miniu¢um sight distance. <br />5-502 N. Alignment <br />Alignment between control points shall. achieve a <br />standard commensurate with topography, terrain, design <br />traffic, and reasonably obtainable right-of-way, as <br />determined by the County Engineer. Sudden changes <br />between curves of widely different radii or between <br />long tangents and sharp curves shall be prohibited. <br />Design shall accommodate passing opportunities wherever <br />possible. Where crest vertical curves and horizontal <br />curves occur at the same location, above-minimum sight <br />distance design shall be required to assure that the <br />horizontal curve is visible as drivers approach. <br /> <br />.- <br />E.'~~, <br />Page 5-5-10 <br />