Benefit

Through use of the Roll Stability Control (RSC) systems, it was estimated that between 1,422 and 2,037 combination vehicle rollover crashes in curves could be prevented, resulting in effectiveness rates of 37 percent and 53 percent, respectively.


February 2009
Nationwide,United States


Summary Information

The goal of the Federal Motor Carrier Safety Administration (FMCSA) is to reduce the number and severity of commercial motor vehicle (CMV) crashes. Over the last several years, FMCSA has collaborated with the trucking industry to test, evaluate, and encourage the deployment of several onboard safety systems (OSS) for CMVs in an effort to enhance the safety of all roadway users. As part of an ongoing FMCSA effort to encourage voluntary adoption of onboard safety systems, this analysis builds on previous field operational testing by refocusing benefit-cost assessments from more general societal impacts to targeted motor-carrier-industry outcomes, since motor carriers are the end-users responsible for investment and deployment of OSS.

The methodology for this analysis was based on estimates of crash cost avoidance for the primary types of crashes that can be addressed by the RSC systems on combination vehicles. RSC system benefits were based primarily on reducing the occurrence of large-truck rollovers caused by excessive speed in a curve. To obtain a measure of crash cost avoidance, the number of rollovers that the technology is estimated to prevent each year per vehicle miles traveled (VMT) was determined. Next, using information provided by motor carriers, insurance companies, legal experts, and others, the actual crash costs paid by the motor carrier industry was determined for rollovers. As a result, trucking companies can use this cost information as a basis for juxtaposing and evaluating the potential crash avoidance benefits of RSC systems with the purchase and operational costs of these technologies.

FINDINGS

According to the crash data for 2001–2005 provided by the General Estimates System (GES), an average of 2,079 injury and 1,626 PDO rollovers occurred involving combination trucks with a pre-crash movement of negotiating a curve. Additionally, an average of 137 fatal rollover crashes occurred. Rates of effectiveness or crash prevention rates represent the percentage of crashes that RSC systems would have a high probability of preventing. Using information from simulations and motor carrier feedback, a range of efficacy rates was determined, 53% and 37% respectively, and used to estimate the portion of these types of crashes that could be preventable by RSC systems. Table 1 provides the estimated numeric range of crashes preventable by RSC systems which is obtained by multiplying the number of crashes by the rates of effectiveness.


RSC Efficiency Rates
PDO (Property Damage Only) Rollovers
Injury Rollovers
Fatal Rollovers
Total
37%
602
769
51
1,422
53%
862
1,102
73
2,037
Table 1: Estimated Mean Annual Number of Combination Vehicle Rollover Crashes in a Curve Preventable by RSC Systems by Crash Severity, 2001–2005.


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Source

Analysis of Benefits and Costs of Roll Stability Control Systems for the Trucking Industry

Author: Dan Murray, Sandra Shackelford, Amy Houser

Published By: Department of Transportation - Federal Motor Carrier Safety Administration

Source Date: February 2009

URL: http://www.fmcsa.dot.gov/facts-research/research-technology/report/09-020-RP-Roll-Stability.pdf

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Notes

Benefit of the Month for April, 2010 !


Benefit ID: 2009-00607