PRSR 10-12-1994 - Laserfiche WebLink

Home Browse Search

I Feb.8, 1983 BIKEWAYS _24- K. BRIDGES AND GRADE SEPARATIONS • • 1. General • Some type of grade separation should be provided • wherever a combination of vehicular volumes and speeds III and bicycle volumes would warrant some type of physical • 011 separation. Where these conditions exist, and provision • Bikeway of a grade separation structure would not be feasible, the bikeway should be rerouted. Experience has shown that OS 1 structures designed for pedestrian live loads are satisfactory 1 • 1 for bicycle loading. 1 1111 r 2. Highway Bridges with Bikeways 0 11• / Where off-road bikeways are located parallel to t 11 • /ft a highway, there are some conditions where it is necessary 31 , to carry the trails across a highway structure.On controlled �•, _4} access highways with high volumes of vehicle traffic, the -tii �� 1, bikeway should be carried outside of the normal bridge ��'Y- / L 1� shoulder and separated from the shoulder by a physical bar- rier(concrete barrier, railing or fence). $'p. On minor low-speed highways, where vehicular ,p volumes are not great and the roadway shoulder is carried / - across the structure, the bridge shoulders can be utilized • for the bikeway (one-way travel on roadway shoulders). • • Sometimes, it is necessary to widen existing III • bridges to provide adequate width for bikeways.Where it is • anticipated that a bikeway will be provided in the future, Oa• new bridges should be designed to include the appropriate width. Bikeways on highway bridges must be carefully OA I • Oa • coordinated with approach bikeways, to make sure that all elements are compatible. For example, bicycle traffic 1 bound in opposite directions is best accommodated by a 1V, 111 bike lanes on each side of a highway. In such cases, a 3 1 • two-way bikeway on one side of the bridge would normally 1% 0101 be inappropriate, as one direction of bicycle traffic would rst : be required to cross the highway at grade twice, to get to and from the bridge bikeway. Because of the inconven- ience, many bicyclists will attempt to ride on the wrong side of the highway beyond the bridge termini. See Figure ...:4 (`� Bikeway + L for approach and bridge typical sections. ..... Shoulder • Consideration should be given to a bicycle pull-off abutting a bridge. In instances where the bridge is a crest, Additional width to 14 feet to a pull-off area has the added advantage of an overlook be provided at railroad crossing for enjoyment of the scenery and other interesting features to allow cyclist to choose his of the crossing. own crossing route. FIGURE K • 450 CROSSING (Less Desirable) •