Details:

Creators:
Le, Thanh ; Gross, Frank ; Persaud, Bhagwant ; Eccles, Kimberly ; Soika, Jonathan
Le, Thanh ; Gross, Frank ; Persaud, Bhagwant ; Eccles, Kimberly ; Soika, Jonathan Less -
Corporate Creators:
VHB/Vanasse Hangen Brustlin, Inc. ; Persaud Lyon, Inc.
VHB/Vanasse Hangen Brustlin, Inc. ; Persaud Lyon, Inc. Less -
Subject/TRT Terms:
[+]
Traffic Safety Unsignalized Intersections
Publication/ Report Number:
FHWA-HRT-17-086
Resource Type:
Tech Report
OCLC Number:
1023627623
Contracting Officer:
Amjadi, Roya.
Corporate Publisher:
United States. Federal Highway Administration.
Abstract:
The Development of Crash Modification Factors program studied the safety performance of various stop-controlled intersections for the Evaluation of Low-Cost Safety Improvements Pooled Fund Study. This study evaluated the safety effectiveness of multiple low-cost treatments at stop-controlled intersections. Improvements included basic signing and pavement markings. This strategy is intended to reduce the frequency and severity of crashes at stop-controlled intersections by alerting drivers to the presence and type of approaching intersection. Geometric, traffic, and crash data were obtained at three- and four-legged, two- and four-lane major road, and urban and rural stop-controlled intersections in South Carolina. To account for potential selection bias and regression to the mean, an empirical Bayesian before-after analysis was conducted, using reference groups of untreated intersections with similar characteristics to the treated sites. The analysis also controlled for changes in traffic volumes throughout time and time trends in crash counts unrelated to the treatments. The aggregate results indicate reductions for all crash types analyzed (i.e., total, fatal and injury, rear-end, right-angle, and nighttime). The reductions are statistically significant at the 95-percent confidence level for all crash types. For all crash types combined, the crash modification factors (CMFs) are 0.917 for all severities and 0.899 for fatal and injury crashes. The CMFs for rear-end, right-angle, and nighttime crashes are 0.933, 0.941, and 0.853, respectively. The benefit-cost ratio estimated with conservative cost and service life assumptions is 12.4 to 1 for total crashes at unsignalized intersections. The results suggest that the multiple low-cost treatments, even with conservative assumptions on cost, service life, and the value of a statistical life, can be cost effective.
Format:
PDF
Funding:
DTFH61-13-D-00001
Collection(s):
Federal Highway Administration
Main Document Checksum:
[+]
urn:sha256:66ff43e9240f4f1c6c062fde573f233afc10b3f62145f95f5e155d994ed6b3a6
Download URL:
https://rosap.ntl.bts.gov/view/dot/37434/dot_37434_DS1.pdf
File Type:

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