Intersection Crash Prediction Methods for the Highway Safety Manual (2021) / Chapter Skim
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Pages 215-221
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From page 215... ...
215 Chapter 12. Abbreviations, Acronyms, Initialisms, and Symbols AASHTO American Association of State Highway and Transportation Officials ANSI American National Standards Institute CMF crash modification factor CURE cumulative residual DOT Department of Transportation EB Empirical Bayes FB Full Bayesian FHWA Federal Highway Administration HSIS Highway Safety Information System HSM Highway Safety Manual IHSDM Interactive Highway Safety Design Model IIA independence of irrelevant alternatives ISATe Enhanced Interchange Safety Analysis Tool ITE Institute of Transportation Engineers LRS linear reference system MNL multinomial logit MV multiple-vehicle NB negative binomial NeXTA Network Explorer for Traffic Analysis NCHRP National Cooperative Highway Research Program RTM regression-to-the-mean SDF severity distribution function SP single-point diamond interchange SPF safety performance function SV single-vehicle TD tight diamond interchange TWLTL two-way left-turn lane AZ Arizona CA California FL Florida IL Illinois KY Kentucky MA Massachusetts MI Michigan MN Minnesota MO Missouri NH New Hampshire NV Nevada OH Ohio PA Pennsylvania
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From page 216... ...
216 TN Tennessee UT Utah WA Washington ST stop control SG signal control 3ST three-leg intersections with minor road stop control 3STT three-leg intersection with minor road stop control where through movement makes turning maneuver 3SG three-leg intersections with signal control 3aST three-leg intersections with all-way stop control 4ST four-leg intersections with minor road stop control 4SG four-leg intersections with signal control 4aST four-leg intersections with all-way stop control 5SG five-leg intersections with signal control D3ex three-leg terminals with diagonal exit ramp D3en three-leg terminals with diagonal entrance ramp D4 four-leg terminals with diagonal ramps A4 four-leg terminals at four-quadrant parclo A B4 four-leg terminals at four-quadrant parclo B A2 three-leg terminals at two-quadrant parclo A B2 three-leg terminals at two-quadrant parclo B K fatal A incapacitating injury B non-incapacitating injury C possible injury O or PDO property-damage-only FI fatal-and-injury j refers to the severity levels predicted by the SDFs in Chapter 19 of the HSM and takes the value of either K, A, B, or C; for general discussion (e.g., Eq. 27 and beyond)
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217 AADTmin+fif sum of AADTmin and AADTfif (veh/day) AADTxrd AADT on the crossroad (veh/day)
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218 Nbimv(FI) predicted average crash frequency of MV, FI crashes of an intersection for base conditions (crashes/year)
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220 P4x,at,K probability of a fatal crash (given that a fatal or injury crash occurred) for 4-leg intersections (4x)
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221 ndw number of unsignalized driveways on the crossroad leg outside of the interchange and within 250 ft of the ramp terminal nps number of unsignalized public street approaches to the crossroad leg outside of the interchange and within 250 ft of the ramp terminal nmajLTL total number of left-turn lanes on both major road approaches (0, 1, or 2) nmajthru total number of through lanes on the major road nmajRTL total number of right-turn lanes on both major road approaches (0, 1, or 2)
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