Development of a Posted Speed Limit Setting Procedure and Tool (2021) / Chapter Skim
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool v CONTENTS Summary ........................................................................................................................................ 1 Chapter 1.
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool vi Congestion Relationship with Crashes ............................................................................. 19 Percent Trucks Relationship with Crashes .......................................................................
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool vii School/School Zone Relationship with Crashes ............................................................... 26 School/School Zone Relationship with Operating Speed .................................................
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool viii Median Relationship with Crashes ................................................................................... 35 Median Width Relationship with Crashes ........................................................................
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool ix Rounding of Speed Value ................................................................................................. 62 Comparison between Existing Speed Limit Setting Approaches .............................................
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool x Data Analysis -- Methodology ................................................................................................ 101 Regression Model Overview...........................................................................................
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool xi LIST OF TABLES Page Table 1. Factors of urban/suburban city streets that affect crashes.
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool xii Table 35. Estimated regression coefficients for KABCO_NID crashes by path analysis (mediator variable: PSL, CoefVar, PerOvPSL, StdSpd, Pace, or SpdAve)
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NCHRP Web-Only Document 291: Development of a Posted Speed Limit Setting Procedure and Tool xiii LIST OF FIGURES Page Figure 1. Overview of SLS-Procedure to calculate the suggested speed limit.
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