United States Department of Transportation
i
University of Florida (UF) Testbed Initiative – Alternative Transportation Safety Systems
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2020-10-01
[PDF-26.27 MB]
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Edition:May 2018–October 2020
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Abstract:Public transit operators experience a variety of challenges on a daily basis, and advanced driver assistance systems (ADAS) have the potential to decrease crash risks or conflicts associated with transit operation, which could result in a more safe, efficient, and economical service. This study evaluated the safety implications of the Mobileye Shield+ system. This ADAS system was procured and installed on 10 Regional Transit System (RTS) buses in Gainesville, Florida. The study collected data on conflicts detected by the ADAS during stealth mode, during which drivers did not receive alerts, and active mode, during which drivers received alerts. A before-and-after analysis was conducted over a period of one year of operation. The vendor’s visualization interface was explored for analysis; however, manual analysis was adopted for route-based evaluation. Transit operators were interviewed through a focus group study to seek feedback. Lastly, the study developed a benefit-cost analysis tool that utilized crash history along with surrogate safety assessment parameters to predict the rate of return of ADAS investment. Overall, data analysis results showed a reduction in transit bus and pedestrian-related conflicts with the installation of ADAS. Even though transit operators preferred the system, they were concerned about sensitivity and false positive alerts. The benefit-cost analysis tool revealed that these systems would benefit agencies meeting certain criteria, including agencies with high historical crashes, higher vehicle revenue miles, and large transit fleets.
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