United States Department of Transportation
i
Performance Comparisons of Cooperative and Adaptive Cruise Control Testing
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2020-06-29
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[PDF-1.92 MB]
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Abstract:A burgeoning field of research has begun to directly compare the impacts of pairing vehicle automation and connectivity to automation alone. While most recent impact studies that evaluate adaptive cruise control (ACC) and cooperative adaptive cruise control (CACC) rely on traffic simulation, the US Department of Transportation has recently conducted ACC and CACC tests on a closed-loop track with and without vehicle-to-vehicle communications (V2V).
The Cooperative Automated Research Mobility Applications (CARMA) multi-year testing program has studied five passenger vehicles equipped with production ACC technology and more recently with CACC technology featuring dedicated short-range communication (DSRC) systems. These tests were run at the Aberdeen Proving Ground utilizing similar conditions and drive schedules.
We compared the performance of these ACC and CACC runs by examining vehicle trajectory data and assessing any operational and environmental impacts. Our findings confirm earlier modeling studies that indicate a platoon of CACC-enabled vehicles will often stabilize fluctuations in speed and the following time gap between vehicles. Given some limitations in CARMA data quality and in the use of operating modes to calculate tailpipe emissions and fuel consumption, we could not draw definite conclusions on emissions or energy impacts. These results also suggest that, depending on the configuration of the ACC and CACC controls, there may be tradeoffs between improved traffic flow, user comfort, and environmental benefits.
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