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<br /> <br />~. Residential Collector Roads include: <br />a. Read l;nd Roads -More than 2500 feet in length <br />b. Connecting roads between the local residential subdivision roads and the thoroughfare rystem <br />c. Loop Roads - Morc than one (1) mile in length <br />d. Other roads having a "collector" type function in the thoroughfare system <br />TERRAIN CLASSiFICA7IgN LEVEL ROLLING I•IILLY <br />Terrain Classification Definition <br />Leve! -Cross slope range of 0% to 8% <br />Rollintt -Cross Slope range of 8.1% to 15% <br />Hi~IY -Crass slope over 15% _ . <br />Rig}tc of Way Width <br />Curb and Gutter Section 50' S0' S0' <br />Shoulder Section 50' <br />, S0' S0' <br />Pavement Width <br />1 <br />Curti and Gutter Section 34' G~'i 34' G-G 34' G~', <br />Shoulder Section ZO' 20' 20' <br />G~'i refers to face to face of standard curb and gutter section, 6ottota of the "V" to the <br />bottom of the "V^ for the valley types section Other types will be reviewed by the <br />Division Engineer with the G-G limits applicable. <br />Minimum Shoulder Width <br />Shoulder Scctian 6' 6' b' <br />Maximum Cut and Fiil Slopes 2: l 2:1 1 12:1 <br />Design Speed 35 mph 30 mph 25 mph <br />blinimum Sight Distance <br />on Vertical Curves Z50' 200' 150' <br />Minimum Centerline Radius 310' 230' l50' <br />Minimum 5uperclevation Rate <br />for Minimum Radius .08 ft/R .06 ft/ft .04 R/8 <br />Maximum Grade 6% 9% 12% <br />Grades far 100' esch way frgrrt intersection tatcxeding 5 percent ('/°) may be reviewed <br />6y Distrito Engineers for consideration. Grades less thorn 0.5 percent should not be <br />used unless reviewed individually by the District Engineer to deterrt»rte potential <br />maintenance problems. <br />K =Rate of Vertical Curvature <br />_ <br />for minimum sight distance <br />CREST 45 <br />SAG a5 <br />STQP 20 <br />Formula for determination of length of vertical curve required W provide minimum <br />sight distance. <br />IL ° ~-] <br />L =Length of verdcal curve in feet <br />K =Rate of vertical curvature in feat per percent of A <br />A =Algebraic diBerence in gradas in percart <br />30 20 <br />30 20 <br />14 9 <br />15 <br />