United States Department of Transportation
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Variability Analysis of FMVSS-121 Air Brake Systems: 60-mi/hr Service Brake System Performance Data for Truck Tractors
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2021-01-01
[PDF-1.20 MB]
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Alternative Title:Analysis of Variability in Heavy Truck Braking Systems
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Edition:Final Report, May 2018–January 2019
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Abstract:In support of the Federal Motor Carrier Safety Administration’s (FMCSA) ongoing interest in truck platooning, this report summarizes analyses conducted to measure variability in stopping distance tests conducted on commercial truck tractors. The data used were retrieved from tests performed under the controlled conditions specified for FMVSS 121 air brake system compliance testing. The report also explores factors affecting FMVSS-121 stopping distance and stopping distance variability, such as brake type, weight, wheelbase, and tractor antilock braking system (ABS). This analysis uses existing test data collected between 2010 and 2019. The FMVSS-121 data may not exactly reflect many common braking situations experienced by platooning vehicles (the typical braking event does not employ a truck’s full braking capacity), but the data do provide insight into the variability of full-system stopping distance performance. This analysis seeks to identify the variability of the service brake stopping distance as defined by 49 CFR 571.121, S5.3.1 Stopping Distance—trucks and buses. Knowledge of this variability may provide a basis for more focused and platoon-relevant testing.
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