Intersection Crash Prediction Methods for the Highway Safety Manual (2021) / Chapter Skim
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4 Table of Contents Summary ........................................................................................................................................16 Chapter 1. Introduction ..................................................................................................................20 1.1 Background .........................................................................................................20 1.2 Research Objective and Scope ............................................................................21 1.3 Overview of Research Methodology ...................................................................22 1.4 Outline of Report .................................................................................................24 Chapter 2.
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5 Chapter 6. Development of Models for Use in HSM Crash Prediction Methods: Five-Leg Intersections .................................................................................................................................136 6.1 Site Selection and Data Collection ....................................................................136 6.2 Descriptive Statistics of Database .....................................................................139 6.3 Safety Performance Functions -- Model Development .....................................143 6.4 Crash Modification Factors ...............................................................................153 6.5 Severity Distribution Functions ........................................................................154 6.6 Summary of Recommended Models for Incorporation in the HSM .................154 Chapter 7.
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6 Figures Figure 1. HSM definitions of segments and intersections ..........................................................27 Figure 2.
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7 Figure 25. Graphical representation of the SPF for multiple-vehicle FI crashes at three-leg stop-controlled intersections on high-speed urban and suburban arterials ................114 Figure 26.
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8 Figure 47. Comparison of new crash prediction model to existing model in HSM: 4SG for multiple-vehicle crashes for urban and suburban high-speed arterials vs 4SG for multiple vehicle crashes from HSM Chapter 12 (FI crashes)
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9 Figure 63. Graphical representation of the SPF for property-damage-only single-vehicle crashes at three-leg turning intersections on urban and suburban arterials (based on model for total crashes in Equation 53)
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10 Tables Table 1. Intersection types addressed by predictive methods in the first edition of the HSM .............................................................................................................................20 Table 2.
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11 Table 25. SPF coefficients for three-leg intersections with signal control on rural multilane highways ......................................................................................................................88 Table 26.
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12 Table 47. Distribution of multiple-vehicle crashes for intersections on high-speed urban and suburban arterials ................................................................................................126 Table 48.
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13 Table 72. Major- and minor-road AADT and total entering volume statistics for three-leg intersections where the through movements make turning maneuvers at the intersections ...............................................................................................................160 Table 73.
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14 Table 96. SPF coefficients for crossroad ramp terminals at single-point diamond interchanges (based on Equation 57)
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