Crash Modification Factors for Chevrons in Iowa

Hallmark, Shauna L.; Goswamy, Amrita; Midwest Transportation Center; Iowa State University. Center for Transportation Research and Education

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Crash Modification Factors for Chevrons in Iowa

2018-02-02
By Hallmark, Shauna L. ; Goswamy, Amrita

[PDF-731.66 KB]

English

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Details:

Creators:

Hallmark, Shauna L. ; Goswamy, Amrita

Hallmark, Shauna L. ; Goswamy, Amrita Less -
Corporate Creators:

Midwest Transportation Center ; Iowa State University. Center for Transportation Research and Education

Midwest Transportation Center ; Iowa State University. Center for Transportation Research and Education Less -
Corporate Contributors:

United States. Dept. of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Federal Highway Administration

United States. Dept. of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Federal Highway Administration Less -
Subject/TRT Terms:

[+]

Chevrons Highway Curves Highway Safety Traffic Safety Traffic Signs Warning Signs
Resource Type:

Tech Report
Geographical Coverage:

Iowa ; United States

Iowa ; United States Less -
Corporate Publisher:

Midwest Transportation Center
Abstract:

Although chevron alignment signs have been utilized for some time along horizontal curves, their effectiveness is not well documented. The Crash Modification Factors Clearinghouse includes crash modification factors (CMFs) for chevrons from 0.41 to 1.92 (FHWA 2015). The lack of documentation on the effectiveness of chevrons and the range of values for CMFs make it difficult for agencies to estimate the cost effectiveness of chevrons. As a result, the objective of this study was to develop a CMF for chevron alignment signs that can be used by Iowa agencies to help address crashes on curves. Chevrons provide additional emphasis and guidance for drivers. If spaced properly, chevrons can delineate the curve so that drivers can interpret the sharpness of the curve. Chevrons are intended to warn drivers of an approaching curve and because of their pattern and size define the direction and sharpness of a horizontal curve (Torbic et al. 2004).
Format:

PDF
Funding:

DTRT13-G-UTC37
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:ab9283b213e2d8795dcd161ff16b26f8f224d8faa0ba703eb2f836c26f5fa059
Download URL:

https://rosap.ntl.bts.gov/view/dot/35563/dot_35563_DS1.pdf
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Crash Modification Factors for Chevrons in Iowa

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