Application of Crash Modification Factors for Access Management, Volume 1: Practitioner's Guide (2021) / Chapter Skim
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Pages 156-170
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156 This appendix provides corridor-level models to support the methods in Chapter 5. The models are organized by land use (mixed-use, commercial, and residential)
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Summary of Models by Land Use and Crash Type 157 Injury Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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158 Application of Crash Modification Factors for Access Management Turning Crashes Model form for Alternate Model 1 and Model 2: Crashes/MVMT = exp(intercept+Region)
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Summary of Models by Land Use and Crash Type 159 Rear-End Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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160 Application of Crash Modification Factors for Access Management Right-Angle Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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Summary of Models by Land Use and Crash Type 161 Commercial Models Total Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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162 Application of Crash Modification Factors for Access Management Variable Estimate Standard Error P-Value Intercept -0.9792 0.8386 0.2430 Region 0.2383 0.1497 0.1113 AADT 0.3225 0.0797 <0.0001 PROPNODEV -0.6472 0.3040 0.0333 PROPLANE1 -0.6047 0.2631 0.0216 Dispersion (k) 0.4228 -- -- Comments: Region is included for NC or MN; a value of 0 if in northern or southern CA.
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Summary of Models by Land Use and Crash Type 163 Turning Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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164 Application of Crash Modification Factors for Access Management Right-Angle Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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Summary of Models by Land Use and Crash Type 165 Residential Models Total Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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166 Application of Crash Modification Factors for Access Management Injury Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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Summary of Models by Land Use and Crash Type 167 Turning Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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168 Application of Crash Modification Factors for Access Management Rear-End Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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Summary of Models by Land Use and Crash Type 169 Right-Angle Crashes Model form: Crashes/mile/year = exp(intercept+Region)
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170 Application of Crash Modification Factors for Access Management Variable Estimate Standard Error P-Value Intercept -2.1173 0.6540 0.0012 Region 1.1970 0.1314 <0.0001 AADT 0.1768 0.0639 0.0057 SIGDENS 0.2084 0.0390 <0.0001 ACCDENS 0.0044 0.0028 0.1078 Dispersion (k) 0.6790 -- -- Comments: This model was developed from the dataset combining all land use types with factor variables representing the land use.
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