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BIKEWAY STRUCTURE <br />Two structural requirements for a bikeway are: first, that it <br />must be able to support the wheel loads of bicycles, riders, <br />and other vehicles which may cross or use the bikeway. Secondly, <br />it is equally essential that a riding surface which is as smooth <br />as possible be maintained as bicycles do not have adequate <br />absorbing systems and give a very stiff ride as they travel on <br />tires inflated to about 80 pounds per square inch. Speci f i c <br />problem areas which should be minimized are expansion and <br />pavement joints, patching, chuck holes, and the use of existing <br />concrete sidewalks where upheavel has occurred. Additionally, <br />where bike lanes are established on existing roadways or streets, <br />grating and gutter joints should be situated in such a manner <br />that the cyclist does not skid. <br />Surfaces of loose gravel will also induce skidding and should <br />be avoided. This is often true with bicycle paths which are <br />especially created for recreational trips. <br />The specific design for structural sections will vary according <br />to soils, climate, materials, and construction practices of the <br />locality. However, a general guide is provided on the following <br />page (Figure 18) . <br />-4O- <br />