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Title:

Estimating Crash Modification Factors Using Cross-Sectional and Case-Control Methods for Rumble Strips and Paved Shoulders
Cover of Estimating Crash Modification Factors Using Cross-Sectional and Case-Control Methods for Rumble Strips and Paved Shoulders

Accession Number:

01628107

Record Type:

Component

Abstract:

This paper describes the application of case-control and cross-sectional methods to develop crash modification factors (CMFs) for lane departure countermeasures in two-lane rural undivided road segments in Kansas. Four commonly used countermeasures, namely 2-ft paved shoulders,centerline rumble strips, shoulder rumble strips, and shoulder & centerline rumble strips have been considered. CMFs were calculated for all severity and fatal & injury lane departure crashes. Generalized linear regression assuming a negative binomial error structure and logistic regression were used in developing models for cross-sectional and case-control methods respectively. Mean residuals and mean squared error (MSE) were used to validate the models developed for cross-sectional method. Classification tables were used to validate the models developed for case-control method. Cross-sectional method shows that all the countermeasures considered in this study were effective in reducing all severity and fatal & injury lane departure crashes. However, the range of CMF includes 1, for the shoulder rumble strips on curved road segments for all crash severities, which indicates that it has some crash increasing effect. The case-control study also shows that all the countermeasures have a crash reduction effect except shoulder rumble strips on curved road segments for all crash severities. Even though similar results were obtained from both methods, CMFs developed using the cross-sectional method demonstrated a narrower range than the case-control method indicating that the results from the cross-sectional method can be considered as more accurate and reliable than those from case-control method.

Supplemental Notes:

This paper was sponsored by TRB committee AFB10 Standing Committee on Geometric Design.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-01474

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Galgamuwa, Uditha
Dissanayake, Sunanda

Pagination:

19p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

References; Tables

Uncontrolled Terms:

Case-control studies

Subject Areas:

Highways; Operations and Traffic Management; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-01474

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Dec 8 2016 10:29AM