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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| REPORT |
| This report is an archived publication and may contain dated technical, contact, and link information |
 |
| Publication Number: FHWA-HRT-18-041 Date: July 2018 |
Publication Number: FHWA-HRT-18-041 Date: July 2018 |
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This report documents the results and conclusions of an initial experiment that examined human-factors issues in the use of adaptive cruise control (ACC) and a hypothetical cooperative ACC (CACC), which is an ACC system enhanced with vehicle-to-vehicle (V2V) communications to share information on speed, brake position, and distance between vehicles. In this driving simulator–based experiment, the CACC system was modeled to accelerate and decelerate less aggressively when the ACC radar lost track of the vehicle ahead on a curve. In addition to testing driver responses to two cruise-control systems, three cruise-control displays were tested. One display showed only whether cruise control was turned on or off. A second display showed not only whether the display was on or off, but also whether the system was tracking another vehicle. A third display showed which vehicle was being tracked. Drivers of the CACC-equipped vehicle rated their trust in cruise control higher than drivers of the ACC-equipped vehicle did.
It was concluded that supplementing ACC with V2V communications may increase the use of CACC relative to ACC and enhance attendant safety benefits. Providing CACC tracking information similar to that provided in this study does not appear to distract drivers; however, additional testing in more complex driving environments is recommended. This research should be of interest to developers of Level 1–automated systems and to safety professionals seeking to understand the benefits and opportunities of this technology to improve roadway safety.
Monique R. Evans, P.E., CPM
Director, Office of Safety
Research and Development
Notice
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The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers' names appear in this report only because they are considered essential to the objective of the document.
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Technical Report Documentation Page
| 1. Report No.
FHWA-HRT-18-041 |
2. Government Accession No.
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3 Recipient's Catalog No.
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| 4. Title and Subtitle
Driver Acceptance of Connected, Automation-Assisted Cruise Control-Experiment 1 |
5. Report Date
July 2018 |
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| 6. Performing Organization Code
HRDS-30 |
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| 7. Author(s)
Vaughan W. Inman, Steven Jackson, and Peter Chou |
8. Performing Organization Report No.
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| 9. Performing Organization Name and Address
Leidos, Inc. |
10. Work Unit No. (TRAIS)
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| 11. Contract or Grant No.
DTFH61-13-D-00024 |
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| 12. Sponsoring Agency Name and Address
Office of Safety Research and Development |
13. Type of Report and Period Covered
Technical report; March 2016–June 2017 |
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| 14. Sponsoring Agency Code
FHWA ITS JPO |
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| 15. Supplementary Notes
The Federal Highway Administration Task Manager was Brian H. Philips (HRDS-30). |
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| 16. Abstract
The results and conclusions of an initial experiment that examined human-factors issues in the use of adaptive cruise control (ACC) and a hypothetical cooperative ACC (CACC) in which ACC supplemented with vehicle-to-vehicle (V2V) communications to extend ACC capabilities. In this driving simulator–based experiment, the CACC system was modeled to accelerate and decelerate less aggressively when the ACC radar lost track of the vehicle ahead on a curve. In addition to testing driver responses to two cruise-control systems, three cruise-control displays were tested. One display showed only whether cruise control was turned on or off. A second display showed not only whether the display was on or off, but also whether the system was tracking another vehicle. A third display incorporated a video of the road ahead with the second display and indicated which vehicle was being tracked. Drivers of the CACC-equipped vehicle rated their trust in cruise control higher than drivers of the ACC-equipped vehicle did. Drivers looked at the second and third display types about 2 percent of the time. However, no glance longer than 0.73 s to any cruise-control display was observed. It was concluded that supplementing ACC with V2V communications may increase system use relative to ACC and provide additional safety benefits. Providing ACC tracking information similar to that provided in this study does not appear to distract drivers; however, additional testing in more complex driving environments is recommended. This research should be of interest to researchers and developers of Level 1–automated systems. |
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| 17. Key Words
Level-1 automation, adaptive cruise control, ACC, cooperative adaptive cruise control, CACC, cruise-control display, trust, glance behavior |
18. Distribution Statement
No restrictions. This document is available through the National Technical Information Service, Springfield, VA 22161. |
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| 19. Security Classification (of this report) Unclassified |
20. Security Classification (of this page) Unclassified |
21. No. of Pages
39 |
22. Price
N/A |
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| Form DOT F 1700.7 (8-72) | Reproduction of completed page authorized |
