United States Department of Transportation
i
Safety benefits of stability control systems for tractor-semitrailers.
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2009-10-01
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[PDF-2.05 MB]
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Edition:Final report; Sept. 2006-May 2008.
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Abstract:This study was conducted by the University of Michigan Transportation Research Institute
(UMTRI) under a Cooperative Agreement between NHTSA and Meritor WABCO to examine
the performance of electronic stability control (ESC) systems, and roll stability control (RSC)
systems for heavy-truck tractor-semitrailers. The study is based on the analysis of independent
crash datasets using engineering and statistical techniques to estimate the probable safety
benefits of stability control technologies for 5-axle tractor-semitrailer vehicles. The
conventional approach for assessing the safety benefits of vehicle technologies is to analyze
crash datasets containing data on the safety performance of vehicles equipped with the
technology of interest. Because the deployment of the stability technologies for large trucks is
in its infancy, national crash databases do not yet have a sufficient amount of factual data that
can be directly linked to the performance of the technology. Therefore a novel method of
examining the potential benefits of these systems was used. Crash scenarios that could likely
benefit from the technologies were selected from national crash databases and the probable
effectiveness of each technology was estimated. The analysis in this study did not have the
advantage of examining representative crash datasets that contain identifiable data from vehicles
equipped with the technology. Therefore, the analysis was based on probable outcome
estimates derived from hardware-in-the-loop simulation, field test experience, expert panel
assessment, and fleet crash data and these methods were used to estimate the safety benefits
from the national crash data population.
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