Laserfiche WebLink
<br />5-502 P. Traveled Way Crown <br />The following table establishes acceptable pavement or <br />surfacing crown adequate to provide px-oper drainage: <br />Surface Ranae in Rate of Cro::s Slope <br />Tyne Inch Per Foot Foot Per Foot <br />High <br />Intermediate <br />Low <br />3/16 - 1/4 <br />3/16 - 3/8 <br />1/4 - 1/2 <br />5-502 4- Superelevation <br />015 - .02 <br />.015 - .03 <br />02 - .04 <br />Superelevation runoff is the length of highway needed <br />to accomplish the change in cross slope from a normal <br />crown section to a fully superelevated. section. For <br />roads where snow and ice conditions prevail the <br />Superelevation shall not exceed 0.08 feet per foot. <br />The following table establishes minimum lengths of <br />runoff. Adjustments in design runoff lengths may be <br />necessary, as determined by the County Engineer, for <br />smooth riding, surface drainage, and good appearance. <br /> L-Length of runoff in feet for <br />Superelevation design s peed, MPH, for: <br />Rate 10 30 40 50 <br />Foot per foot <br />.02 50 100 125 150 <br />.04 50 100 125 150 <br />.06 50 110 125 150 <br />.08 50 145 170 190 <br />5-502 R. Number of Lanes <br />The number of lanes shall accommodate the design <br />volume. The majority of roads in San :Miguel County <br />will have two lanes. Where more than two lanes are <br />warranted to accommodate design volumes, <br />determinations of design shall be made as indicated in <br />American Association of State Highway and <br />Transportation Officials (AASHTO) Design Standards far <br />Highways Other Than Freeways. <br />5-502.5. Width of Driving Surface, Shoulder and Roadway <br />The following table establishes mir~imwn width of <br />driving surface and of graded usable shoulder for <br /> <br />Page 5-5-12 <br />~i <br />