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Title:

Crash Modification Functions for Rural Skewed Intersections

Accession Number:

01851230

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

This study evaluated the safety influence of intersection skew angle on rural two-lane, two-way facilities by calibrating crash modification factors. Ten years of crash history among federal aid and nonfederal aid highways was used to develop crash modification functions at three-leg and four-leg stop-controlled intersections. Skew angle was investigated as a parameter in the safety performance functions models both as a continuous variable, with observed values ranging from zero to 80°, and categorized into ranges. A few transformations of the skew parameter were considered, such as the flexible-form model having skew interaction with annual average daily traffic, and a Hoerl curve. Both three-leg and four-leg intersections exhibited an initially increasing trend of crash rates followed by a decreasing trend as the skew angle increased. A categorical model was found to best describe the skew relationship using discrete skew angle ranges. Among three-leg intersections, a skew angle between 17° and 27° experienced 22% more crashes than perpendicular intersections. However, more highly skewed three-leg intersections exhibited a decreasing relationship to increasing skew angle. Among four-leg intersections, a skew angle between 17° and 27° experienced 40% more crashes, whereas intersections with a skew angle greater than 45° did not have significantly different crash occurrence than perpendicular intersections. The implications of assuming a monotonic increasing relationship to skew angle are challenged as a result of this study.

Supplemental Notes:

Anthony Ingle https://orcid.org/0000-0003-1453-7493© National Academy of Sciences: Transportation Research Board 2022.

Language:

English

Authors:

Ingle, Anthony

ORCID 0000-0003-1453-7493

Gates, Timothy J

ORCID 0000-0002-7429-0990

Pagination:

pp 1604-1617

Publication Date:

2023-1

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Volume: 2677
Issue Number: 1
Publisher: Sage Publications, Incorporated
ISSN: 0361-1981
EISSN: 2169-4052
Serial URL: http://journals.sagepub.com/home/trr

Media Type:

Web

Features:

References (18)

Subject Areas:

Design; Highways; Safety and Human Factors

Files:

TRIS, TRB, ATRI

Created Date:

Jul 10 2022 3:00PM