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i <br />bicyclist travels in the range of 7 to 15 miles per hour <br />with the higher speeds occurring on downgrades. The average <br />speed is 10 to 11 miles per hour. Therefore the design <br />speed should be a minimum of 10 miles per hour but normally <br />15 miles per hour, and on long downgrades it should be 20 <br />miles per hour or more <br />Curvature <br />Table 3. Curvature, 'is f or use in constructing independent <br />bike paths with token or no banking provided. In the case <br />of bicycle lanes and routes, the roadway curvature provided <br />motor vehicles will be more than adequate for bicycles but <br />should be checked for potentially hazardous conditions <br />TABLE 3 <br />CURVATURE <br />Design Seed m1Qh } Design Radius (f eet ) <br />10 <br />15 <br />15 <br />35 <br />20 <br />70 <br />25 <br />90 <br />30 <br />125 <br />Su erelevation or Bankin <br />All vehicles in negotiating a curve encounter a force which <br />tends to push them to the outside of the turn. In the <br />instance of automobiles, to counteract this tendency, super- <br />elevation or banking becomes a design element of the roadway. <br />By banking the roadway an auto's weight then becomes centered <br />to the inside of the curve; thus, counteracting the force <br />to be pushed outside of the curve. Bicyclists are able to <br />lean their weight to the inside of a turn and in such a <br />manner, counteract the force to be pushed outside of the <br />curve. <br />In light of the foregoing, banking is not recommended on <br />all bikeway curves, However, on curves which occur on <br />downgrades? where the speed of bicyclists will be faster <br />than average, or on curves with short radii, it may be <br />_16� <br />