Use of the Output of the Driver Vehicle Module of the IHDSM as Surrogate Measures for Departure Crashes
This paper presents the results of a research that investigates whether four output measures of the Interactive Highway Safety Design Manual (IHSDM) Driver Vehicle Module (DVM), longitudinal and lateral Friction Ratios, Lateral Offset, and Roll-Over Index, follow the Normal distribution. The research then studies how the lateral offset can be used as a surrogate measure for departure crashes. The “UNIVARIATE” procedure of SAS software was used in the normality tests. Besides the graphical outputs, the skewness and Kurtosis values as well as the Shapiro-Wilk and the Anderson-Darling tests results were reviewed. For Lateral Offset, the authors could not reject the hypothesis that these data are normally distributed for results of 95 locations (α=5%). The results for longitudinal and lateral Friction Ratio, and Roll-Over Index were 73, 84, and 83 locations, respectively. The data used in this study come from running the DVM simulation on stretches of two-lane rural highways from Washington State. For the normality testing the simulation output of 100 randomly selected locations were studied. For studying the lateral offset as a surrogate measure the probabilities of Lateral Offset values exceeding the threshold values (encroachments) were calculated and the relations of these encroachments with departure crashes was studied. In this part of the study it was observed that for highways with narrow shoulders there exists a strong correlation between number of encroachments and the departure crash rates. The authors concluded that this measure can be used as a surrogate measures for departure crashes for this type of highway.
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Supplemental Notes:
- The Table of Contents on the website lists the title of this paper as "Use of Driver Vehicle Module Output from Interactive Highway Safety Design Model as Surrogate measures for Departure Crashes". Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Corporate Authors:
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Authors:
- Banihashemi, Mohamadreza
- Dimaiuta, Michael
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Conference:
- 3rd International Conference on Road Safety and Simulation
- Location: Indianapolis Indiana, United States
- Date: 2011-9-14 to 2011-9-16
- Publication Date: 2011
Language
- English
Media Info
- Media Type: Digital/other
- Features: Appendices; Figures; References; Tables;
- Pagination: 17p
- Monograph Title: 3rd International Conference on Road Safety and Simulation
Subject/Index Terms
- TRT Terms: Highway safety; Ran off road crashes; Rollover crashes; Rural highways; Two lane highways
- Identifier Terms: Interactive Highway Safety Design Model
- Geographic Terms: Washington (State)
- Subject Areas: Highways; Safety and Human Factors; I80: Accident Studies;
Filing Info
- Accession Number: 01504289
- Record Type: Publication
- Files: TRIS, TRB, ATRI
- Created Date: Jan 24 2014 2:29PM