United States Department of Transportation
i
Safety Impact Assessment of THEA Connected Vehicle Pilot Safety Applications
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2022-03-01
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[PDF-4.78 MB]
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Abstract:This report presents the methodology and results of the safety impact assessment of four vehicle-to-vehicle (V2V) and three vehicle-to-infrastructure (V2I) safety applications that were deployed in Tampa’s Connected Vehicle Pilot site. This assessment was based on the naturalistic driving experience of over 800 vehicles that were equipped with these applications, spanning from March 2019 through June 2020. The V2V applications included forward crash warning, emergency electronic brake light, intersection movement assist, and vehicle turning right in front of transit vehicle warning. Pedestrian collision warning, end of ramp deceleration warning, and wrong-way entry warning comprised the V2I applications. About 320 equipped vehicles received 8,073 alerts from the seven safety applications combined, while about 500 equipped vehicles did not have any alert events. There were 508 V2V alert events (6%) and 7,565 V2I alert events (94%). The analysis methodology assessed the validity of these alerts and determined their usefulness for examining the safety impact of each application. Useful alerts were later used to compare driver/vehicle response after alert onset between silent (human-machine interface or HMI off) and active (HMI on) alert groups. The results provided insight into improving the performance of the safety applications and delineated the conditions and vehicle response to specific alert events.
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