Guidelines for the Application of Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities (2016) / Chapter Skim
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Pages 117-124
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From page 117... ...
NCHRP 3-78b: Final Project Report April 2016 117 8 APPENDIX B: YIELD MODEL DETAILS This appendix summarizes the yield modeling results for the combined data for TOPR-34 and NCHRP 3-78b. In order to create models to predict driver yielding rates for blind and sighted pedestrians, Stata was used to analyze data collected at two-lane roundabouts in Ohio, Maryland, Michigan, North Carolina, Washington, Oregon, Indiana, Wisconsin, and New York.
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NCHRP 3-78b: Final Project Report April 2016 118 pedestrian took one step "into" the crosswalk in accordance with most states' yielding laws. Variables collected are shown in Table 9-1.
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From page 119... ...
NCHRP 3-78b: Final Project Report April 2016 119 • Full Model – uses all independent variables regardless of p-value. • Manual Selection – a custom model that is informed by the first modeling result and examination of correlation and collinearity, and considers practical significance and feasibility of implementing variables in simulation rather than focusing on statistical fit.
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From page 120... ...
NCHRP 3-78b: Final Project Report April 2016 120 Table 8-4: Correlation Table for Roundabout Sites n=55 YIELDR EXT RDS XSPD_AVE RRFB SIGHT_D OL_DEC YIELDR 1.0000 Pe ar so n Co rr el at io n EXT -0.2494*
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From page 121... ...
NCHRP 3-78b: Final Project Report April 2016 121 Table 8-5: Full Model to Predict Yielding Rates to "Blind" and "Sighted" Pedestrians All Sites Regression Coefficient Std Error p 95% Conf Interval EXT 4.652 9.218 0.616 -13.882 23.186 RDS -0.070 0.018 0.000*
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From page 122... ...
NCHRP 3-78b: Final Project Report April 2016 122 R2 0.354 0.392 0.399 0.406 0.400 0.406 Adj.
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From page 123... ...
NCHRP 3-78b: Final Project Report April 2016 123 Table 8-9: Recommended Behavioral Model to Predict Yielding Rates to "Blind" and "Sighted" Pedestrians YIELDR Regression Coefficient Std Error p 95% Conf Interval centeredXSPD_AVE -11.996 3.518 0.001 -19.055 -4.937 RRFB 8.093 7.563 0.290 -7.084 23.270 Constant 64.050 6.040 0.000 51.929 76.171 Prob > F 0.004 R2 0.194 Adj.
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From page 124... ...
NCHRP 3-78b: Final Project Report April 2016 124 12 NC Davidson Davidson Gateway-Harbour Place/Griffith West Exit 13 WA Olympia 4th/Olympic East Entry 14 WA Olympia 4th/Olympic North Entry 15 WA Olympia 4th/Olympic North Exit 16 WA Olympia 14th/Jefferson East Entry 17 WA Olympia 14th/Jefferson East Exit 18 OR Springfield Pioneer/Hayden Bridge East Entry 19 OR Springfield Pioneer/Hayden Bridge East Exit 20 OR Springfield Pioneer/Hayden Bridge South Entry 21 OR Springfield Pioneer/Hayden Bridge South Exit 22 IN Carmel Clay Terrace/Clay Terrace North Entry 23 IN Carmel Clay Terrace/Clay Terrace North Exit 24 WI Oshkosh Jackson/Murdock South Entry 25 WI Oshkosh Jackson/Murdock South Exit 26 WI Oshkosh Jackson/Murdock East Entry 27 WI Oshkosh Jackson/Murdock East Exit 28 NY Albany Fuller/Washington North Exit 29 NY Albany Fuller/Washington South Entry 30 NY Albany Fuller/Washington South Exit
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