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<br /> <br />5-502 K. Design Speed <br />The selection of design speed is influenced principally <br />by the terrain character, traffic volume, and economic <br />considerations. The following table establishes <br />appropriate ranges of design speeds for various <br />conditions: <br />Level 30 ; 30 40 , 50 55 ; 55 65 <br /> ~ ~ i <br />Rolling 20 , 25 30 ; 40 45 ; 50 55 <br /> ~ i <br />Moun- 15 ; 20 25 ; 30 35 ; 40 45 <br />tainous ; <br /> Access; Local ; Collector ; Minor Prnc. <br /> Tract; Access , ; Arterial <br />See Figure 5-iG for a summary of values of roadway <br />physical elements for various design speeds. <br />:~~>~ <br />5-502 L. Grades <br />Road grades (expressed in percent) shall not exceed the <br />following values: <br />Design Speed MPH <br />Type of Terrain 15 20 25 30 35 40+ 50+ <br />Level 8 8 7 6 5 4 3 <br />Rolling 8 8 8 7 6 5 4 <br />Mountainous 10 10 9 8 8 7 6 <br />Curves with centerline radii of less than 250 feet <br />shall not exceed eight percent. <br />Page 5-5-9 <br />