Safety Evaluation of Cable Median Barriers in Combination with Rumble Strips on Divided Roads

Srinivasan, Raghavan; Lan, Bo; Carter, Daniel; Persaud, Bhagwant Naraine, 1947-; Eccles, Kimberly; VHB/Vanasse Hangen Brustlin, Inc.; Persaud Lyon, Inc.

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Safety Evaluation of Cable Median Barriers in Combination with Rumble Strips on Divided Roads

2017-08-01
By Srinivasan, Raghavan ; Lan, Bo ; Carter, Daniel ; ...

[PDF-2.07 MB]

English

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Details:

Creators:

Srinivasan, Raghavan ; Lan, Bo ; Carter, Daniel ; Persaud, Bhagwant Naraine, 1947- ; Eccles, Kimberly

Srinivasan, Raghavan ; Lan, Bo ; Carter, Daniel ; Persaud, Bhagwant Naraine, 1947- ; Eccles, Kimberly Less -
Corporate Creators:

VHB/Vanasse Hangen Brustlin, Inc. ; Persaud Lyon, Inc.

VHB/Vanasse Hangen Brustlin, Inc. ; Persaud Lyon, Inc. Less -
Corporate Contributors:

Turner-Fairbank Highway Research Center ; United States. Federal Highway Administration. Office of Safety Research and Development

Turner-Fairbank Highway Research Center ; United States. Federal Highway Administration. Office of Safety Research and Development Less -
Subject/TRT Terms:

[+]

Cable Barrier Cross-median Cross-median Crashes Empirical Bayesian Head-on Injury Low-cost Median Barrier Median Barriers Rumble Strips Safety Evaluations Safety Improvements Side Collisions Sideswipe
Publication/ Report Number:

FHWA-HRT-17-070
Resource Type:

Tech Report
OCLC Number:

1005512121
Contracting Officer:

Amjadi, Roya
Corporate Publisher:

United States. Federal Highway Administration
Abstract:

The Development of Crash Modification Factors program conducted the safety evaluation of cable median barriers in combination with rumble strips on the inside shoulder of divided roads for the Evaluation of Low Cost Safety Improvements Pooled Fund Study. This study evaluated safety effectiveness of cable median barriers in combination with rumble strips on the inside shoulders of divided roads. This strategy is intended to reduce the frequency of cross-median crashes, which tend to be very severe. Geometric, traffic, and crash data were obtained for divided roads in Illinois, Kentucky, and Missouri. To account for potential selection bias and regression-to-the-mean, an empirical Bayes before-after analysis was conducted using reference groups of untreated roads with characteristics similar to those of the treated sites. The analysis also controlled for changes in traffic volumes over time and time trends in crash counts unrelated to the treatment. In Illinois and Kentucky, cable median barriers were introduced many years after the inside shoulder rumble strips were installed; therefore, the evaluation determined the safety effect of implementing cable barriers along sections that already had rumble strips. Conversely, in Missouri, the inside shoulder rumble strips and cable barrier were implemented around the same time. Hence, the evaluation in Missouri determined the combined safety effect of inside shoulder rumble strips and cable barriers. The combined Illinois and Kentucky results indicate about a 27-percent increase in total crashes; a 24-percent decrease in fatal, incapacitating injury crashes; and a 48-percent decrease in head-on plus opposite-direction sideswipe crashes (used as a proxy for cross-median indicator plus head-on). the economic analysis for benefit-cost ratios shows that this strategy is cost beneficial.
Format:

PDF
Alternate URL:

https://www.fhwa.dot.gov/publications/research/safety/17070/index.cfm ; https://www.fhwa.dot.gov/publications/research/safety/17070/17070.pdf ;
Funding:

DTFH61-13-D-00001
Collection(s):

Federal Highway Administration
Main Document Checksum:

[+]

urn:sha256:10102b5b2e310f52f7052d56ffe383704a4329570a4843031e3fc6b9be6f1564
Download URL:

https://rosap.ntl.bts.gov/view/dot/37806/dot_37806_DS1.pdf
File Type:

	index.cfm	html
	17070.pdf	pdf

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