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Safety benefits of automated speed advisory systems at signalized intersections

Wooseok Do, Nicolas Saunier and Luis Miranda-Moreno

Article (2023)

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Human-driving behavior at signalized intersections may lack efficiency because drivers try to reach their desired speed without the upcoming traffic-signal information. This causes idling time, sharp accelerations, hard braking, traffic congestion, emissions, and energy consumption. Connected vehicles, for example those equipped with a speed advisory system (SAS), can provide prior information to drivers for optimizing their driving behavior while approaching signalized intersections. However, the current literature focuses only on the fuel consumption, emissions, and travel-delay reduction impacts of SASs. This paper evaluates the safety impact of SAS vehicles using the proposed approach that simulates mixed-traffic situations between SAS and human-driven vehicles (HDVs). HDVs in the model follow real vehicle trajectories based on car-following conditions. The study investigates various scenarios including the impact of the different ranks of SAS vehicles in the vehicle group, the lane-changing possibility, and market penetration rates (MPRs). The results suggest that SAS vehicles can reduce rear-end collision risks from 25% MPR. The minimum time to collision increases by 1.2 s and the deceleration rate to avoid crash declines by 0.3 on average for 100% MPR relative to 0%. The study demonstrated that this safety benefit is also strongly related to the rank of SAS vehicles within a vehicle group. In addition, the conflict locations in the approaching lane gradually move away from the intersection up to where the communication range starts as the MPR increases, which would reduce abrupt vehicle speed changes near pedestrian crosswalks.

Uncontrolled Keywords

automated/autonomous/connected vehicles; intelligent transportation systems; operations; safety; surrogate safety measures; traffic simulation

Subjects: 1000 Civil engineering > 1000 Civil engineering
1000 Civil engineering > 1003 Transportation engineering
Department: Department of Civil, Geological and Mining Engineering
Funders: MITACS
Grant number: IT12149
PolyPublie URL: https://publications.polymtl.ca/53705/
Journal Title: Journal of the Transportation Research Record (vol. 2677, no. 3)
Publisher: SAGE Publications Ltd
DOI: 10.1177/03611981221115725
Official URL: https://doi.org/10.1177/03611981221115725
Date Deposited: 10 Jul 2023 16:30
Last Modified: 05 Apr 2024 17:12
Cite in APA 7: Do, W., Saunier, N., & Miranda-Moreno, L. (2023). Safety benefits of automated speed advisory systems at signalized intersections. Journal of the Transportation Research Record, 2677(3), 551-564. https://doi.org/10.1177/03611981221115725


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