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Updating the Crash Modification Factors and Calibrating the IHSDM for Indiana

Author: Andrew Tarko

Publisher:

Published: 2018-08-15

Total Pages:

ISBN-13: 9781622604951

The Interactive Highway Safety Design Model (IHSDM) is a tool for assessing the safety impact of project-level design decisions by implementing the HSM crash prediction methodology. Safety Performance Functions (SPFs), Crash Modification Factors/Functions (CMFs), calibration factors, and crash proportions are utilized in predicting the number, severity, and type of crashes occurring on various types of roadway facilities. This study updated and expanded the set of CMFs applicable to Indiana conditions for various geometric, traffic, pavement, and other road characteristics. CMFs for 80 various road and control improvements for urban and rural segments, intersections, and interchanges. This report also presents the methodology of calibrating the IHSDM's predictive components based on local data and past research. This method jointly estimates the SPFs and CMFs to preserve the crash prediction consistency. SPFs, CMFs, and crash proportions were calibrated for Indiana rural two-lane segments, rural divided multilane segments, and urban/suburban arterial segments. Example calculations showed that some results were only slightly affected while others vary considerably. This finding confirms the need for calibrating the parameters in the IHSDM to local conditions.

Statistical Methods in Highway Safety Analysis

Author: Bhagwant Naraine Persaud

Publisher:

Published: 2001

Total Pages: 88

ISBN-13:

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TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 295: Statistical Methods in Highway Safety Analysis focus on the type of safety analysis required to support traditional engineering functions, such as the identification of hazardous locations and the development and evaluation of countermeasures. Analyses related specifically to driver and vehicle safety are not covered, but some statistical methods used in these areas are of relevance and are summarized where appropriate.

Driver Expectancy in Highway Design and Traffic Operations

Author: Gerson J. Alexander

Publisher:

Published: 1986

Total Pages: 48

ISBN-13:

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Expectancy relates to a driver's readiness to respond to situations, events, and information in predictable and successful ways. This report describes the concept of driver expectancy in the context of the driving task, and provides examples of expectancy and expectancy violations. It includes a procedure for identifying general and specific expectancy violations to enable engineers to develop remedial treatments to deal with expectancy problems.

Positive Guidance in Traffic Control

Author: Gerson J. Alexander

Publisher:

Published: 1975

Total Pages: 68

ISBN-13:

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The progress that has been made in developing the positive guidance concept is documented, and the meaning of positive guidance, the philosophy of driver performance upon which it is based the nature of the driving task at those locations where positive guidance is applicable, and a procedure for its application are discussed. This report describes what must be done to improve the information system at hazardous locations. Positive guidance which is an information system matched to the facility characteristics and driver attributes, is based on the premise that a driver can be given sufficient information where he needs it and in the form that he can best use to avoid hazards.

Manual on Classification of Motor Vehicle Traffic Accidents

Author: American National Standard

Publisher: CreateSpace

Published: 2007-08-02

Total Pages: 52

ISBN-13: 9781492379454

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The primary purpose of the Manual of Classification of Motor Vehicle Traffic Accidents is to promote uniformity and comparability of motor vehicle traffic accident statistics now being developed in Federal, state and local jurisdictions. This manual is divided into two sections, one containing definitions and one containing classification instructions.

Highway Safety Manual Training Materials

Author: Karen Dixon

Publisher: Transportation Research Board

Published: 2012

Total Pages: 27

ISBN-13: 0309213886

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TRB’s National Cooperative Highway Research Program (NCHRP) Report 715: Highway Safety Manual Training Materials provides training materials to aid in implementing the American Association of State Highway and Transportation Officials’ Highway Safety Manual (HSM).

Traffic Safety Data

Author: United States. Government Accountability Office

Publisher:

Published: 2010

Total Pages: 0

ISBN-13:

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GAOs analysis of traffic records assessments, conducted for states by NHTSA technical teams or contractors at least every 5 years, indicates that the quality of state traffic safety data systems varies across the six data systems maintained by states. Assessments include an evaluation of system quality based on six performance measures.

Roadside Safety Design

Author: United States. Federal Highway Administration

Publisher:

Published: 1975

Total Pages: 276

ISBN-13:

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This roadside safety design package has been developed to satisfy a need for training in this area. It is hoped that all persons involved in the design, construction, operation, and maintenance of highways will become familiar with the concepts contained in the program. The concepts and practices discussed come from those contained in the AASHTO publication, "Highway Design and Operational Practices Related to Highway Safety". They are discussed in considerable depth in this program and should provide a good working knowledge of roadside safety design. Much of the program is oriented around freeways; however, the principles apply equally toward the lower order highway.

User and Non-user Benefit Analysis for Highways

Author:

Publisher: American Association of State Highway & Transportation Officials

Published: 2010-01-01

Total Pages:

ISBN-13: 9781560514671

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This document updates and expands the American Association of State Highway and Transportation Officials (AASHTO) User Benefit Analysis for Highways, also known as the Red Book. This AASHTO publication helps state and local transportation planning authorities evaluate the economic benefits of highway improvements. This update incorporates improvements in user-benefit calculation methods and, for the first time, provides guidance for evaluating important non-user impacts of highways. Previous editions of the Red Book provided guidance regarding user benefit measurement only. This update provides a framework for project evaluations that accurately account for both user and non-user benefits. The manual and accompanying CD-ROM provide a valuable resource for people who analyze the benefits and costs of highway projects.

Highway and Traffic Safety

Author: National Research Council (U.S.). Transportation Research Board

Publisher:

Published: 2000

Total Pages: 148

ISBN-13:

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Transportation Research Record contains the following papers: Method for identifying factors contributing to driver-injury severity in traffic crashes (Chen, WH and Jovanis, PP); Crash- and injury-outcome multipliers (Kim, K); Guidelines for identification of hazardous highway curves (Persaud, B, Retting, RA and Lyon, C); Tools to identify safety issues for a corridor safety-improvement program (Breyer, JP); Prediction of risk of wet-pavement accidents : fuzzy logic model (Xiao, J, Kulakowski, BT and El-Gindy, M); Analysis of accident-reduction factors on California state highways (Hanley, KE, Gibby, AR and Ferrara, T); Injury effects of rollovers and events sequence in single-vehicle crashes (Krull, KA, Khattack, AJ and Council, FM); Analytical modeling of driver-guidance schemes with flow variability considerations (Kaysi, I and Ail, NH); Evaluating the effectiveness of Norway's speak out! road safety campaign : The logic of causal inference in road safety evaluation studies (Elvik, R); Effect of speed, flow, and geometric characteristics on crash frequency for two-lane highways (Garber, NJ and Ehrhart, AA); Development of a relational accident database management system for Mexican federal roads (Mendoza, A, Uribe, A, Gil, GZ and Mayoral, E); Estimating traffic accident rates while accounting for traffic-volume estimation error : a Gibbs sampling approach (Davis, GA); Accident prediction models with and without trend : application of the generalized estimating equations procedure (Lord, D and Persaud, BN); Examination of methods that adjust observed traffic volumes on a network (Kikuchi, S, Miljkovic, D and van Zuylen, HJ); Day-to-day travel-time trends and travel-time prediction form loop-detector data (Kwon, JK, Coifman, B and Bickel, P); Heuristic vehicle classification using inductive signatures on freeways (Sun, C and Ritchie, SG).