Bicycle Railing Height Report - AASHTO - Subcommittee on Design

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DETERMINATION OF APPROPRIATE RAILING HEIGHTS FOR BICYCLISTS NCHRP 20-7 (168) Additional Issues Related to <strong>Railing</strong>s ....................................................................................................... 31 Wind......................................................................................................................................................... 31 Equestrians and Cross Country Skiers .................................................................................................... 31 Vehicle Side Crashes (“Head Slap”)....................................................................................................... 32 CHAPTER 6 - FINDINGS AND RECOMMENDATIONS ....................................33 Recommended Bicycling <strong>Railing</strong> <strong>Height</strong>s................................................................................................ 34 Exceptions................................................................................................................................................ 35 Other Design Considerations .................................................................................................................. 36 Additional Recommendations .................................................................................................................. 39 SUMMARY OF RESEARCHED SOURCES AND INDIVIDUAL CONTACTS....41 Appendix A – <strong>Bicycle</strong> <strong>Railing</strong> <strong>Height</strong> Surveys State Survey and Responses Advocacy Group Survey and Responses Appendix B – <strong>AASHTO</strong> "Standard Specifications for Highway Bridges," 17th Edition, 2002. Section 2.7, <strong>Railing</strong>s. <strong>AASHTO</strong> "Guide Specifications for Bridge <strong>Railing</strong>s," 1987. G2.7, <strong>Railing</strong>s. Appendix C – "A Study on the Required <strong>Height</strong> of a Bridge <strong>Railing</strong> to Accommodate <strong>Bicycle</strong> Impacts," by David W. Orr. ii
DETERMINATION OF APPROPRIATE RAILING HEIGHTS FOR BICYCLISTS NCHRP 20-7 (168) FIGURES Figure 1 - Timeline of <strong>Bicycle</strong> <strong>Railing</strong> <strong>Height</strong>s Guidelines ............................................... 5 Figure 2 - Wyoming Vehicular <strong>Railing</strong> ............................................................................. 8 Figure 3 - Golden Gate Bridge <strong>Railing</strong>s ............................................................................. 9 Figure 4 - <strong>Bicycle</strong> <strong>Railing</strong> - 1.1 Meter High <strong>Railing</strong> ........................................................ 10 Figure 5 - Bicyclist Center of Gravity .............................................................................. 11 Figure 6 - Bicyclist Operating Space................................................................................ 12 Figure 7 - Center of Gravity.............................................................................................. 15 Figure 8 - Simulation Center of Gravity........................................................................... 15 Figure 9 - Preferred <strong>Railing</strong> <strong>Height</strong> of Advocacy Groups ............................................... 19 Figure 10 - Preferred <strong>Railing</strong> <strong>Height</strong> of State Representatives ........................................ 19 Figure 11 - Cone of Vision Angle..................................................................................... 26 Figure 12 - Bridge with Snow Accumulation................................................................... 31 Figure 13 - Golden Gate Bridge........................................................................................ 34 Figure 14 - Application of a 1.4 m (54-inch) High <strong>Railing</strong>.............................................. 35 Figure 15 - Tension Cable <strong>Railing</strong>.................................................................................... 37 Figure 16 - Steel Mesh <strong>Railing</strong> ......................................................................................... 37 Figure 17 - <strong>Bicycle</strong> <strong>Railing</strong> with Extended Top Rail ....................................................... 38 Figure 18 - <strong>Railing</strong>s too close to Path............................................................................... 38 TABLES Table 1- State Adopted <strong>Railing</strong> <strong>Height</strong>s ........................................................................... 13 Table 2 - Documented <strong>Bicycle</strong> Crashes............................................................................ 22 Table 3 - Eye Level <strong>Height</strong> and Associated Cone of Vision Angle ................................. 27 Table 4 - <strong>Bicycle</strong> <strong>Railing</strong> (non-vehicular loading) ........................................................... 29 Table 5 - Comparison of Average Bid Price in New York (2002-2003).......................... 30 iii
Page 1 and 2: NCHRP NATIONAL COOPERATIVE HIGHWAY
Page 3: DETERMINATION OF APPROPRIATE RAILIN
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Page 53 and 54: BICYCLE RAILING HEIGHT SURVEY STATE
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BICYCLE RAILING HEIGHT SURVEY STATE
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5-3. Did the bicyclist fall over th
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Extra expense (significant issue wh
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BICYCLE RAILING HEIGHT SURVEY ADVOC
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2-6. What was the serverity of the
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APPENDIX B
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Bicycle Railing Height Report - AASHTO - Subcommittee on Design

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