Safety Prediction Models for Six-Lane and One-Way Urban and Suburban Arterials (2022) / Chapter Skim
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Pages 125-137
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From page 125... ...
125 CHAPTER 7. PREDICTIVE MODELS FOR URBAN AND SUBURBAN ONE-WAY ARTERIAL ROADWAY SEGMENTS This chapter describes the activities undertaken to calibrate safety predictive models for urban and suburban one-way arterial roadway segments.
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126 Table 68. Supplemental data collected for one-way arterials.
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128 š¯‘¸ = calibration coefficient for variable i. The inverse dispersion parameter K (which is the inverse of the overdispersion parameter k)
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129 Table 69. Calibrated coefficients for FI crashes on one-way arterials.
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130 Table 70. Calibrated coefficients for PDO crashes on one-way arterials.
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131 Figure 31. Graphical form of the SPF for FI multiple-vehicle collisions, one-way arterials.
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132 Figure 33. Graphical form of the SPF for PDO multiple-vehicle collisions, one-way arterials.
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133 Table 71. Distribution of multiple-vehicle collisions for roadway segments by manner of collision type.
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134 VEHICLE-BICYCLE COLLISIONS The number of vehicle-bicycle collisions per year for an intersection is estimated using Equation 158. The bicycle crash adjustment factor is estimated by dividing the vehicle-bicycle crashes by the sum of single-vehicle and multiple-vehicle crashes for each segment type.
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135 Figure 35. Right shoulder width CMF, one-way arterials.
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136 Driveway CMF This CMF is applicable to multiple-vehicle crashes only. Major commercial and minor driveways are found to be significant in influencing the crashes.
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137 Figure 37. Minor driveway CMF, one-way arterials.
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