Deriving Operational Traffic Signal Performance Measures from Vehicle Trajectory Data

Operations-oriented traffic signal performance measures are important for identifying the need for retiming to improve traffic signal operations. Currently, most traffic signal performance measures are obtained from high-resolution traffic signal controller event data, which provides information on an intersection-by-intersection basis and requires significant initial capital investment. Over 400 billion vehicle trajectory points are generated each month in the United States. This paper proposes using high-fidelity vehicle trajectory data to produce traffic signal performance measures such as: split failure, downstream blockage, and quality of progression, as well as traditional Highway Capacity Manual level of service. Geo-fences are created at specific signalized intersections to filter vehicle waypoints that lie within the generated boundaries. These waypoints are then converted into trajectories that are relative to the intersection. A case study is presented that summarizes the performance of an eight-intersection corridor with four different timing plans using over 160,000 trajectories and 1.4 million GPS samples collected during weekdays in July 2019 between 5:00?a.m. and 10:00?p.m. The paper concludes by commenting on current probe data penetration rates, indicating that these techniques can be applied to corridors with annual average daily traffic of ~15,000 vehicles per day for the mainline approaches, and discussing cloud-based implementation opportunities.

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    • The data that support the findings of this study are available from the corresponding author, Enrique Saldivar-Carranza, on reasonable request. © National Academy of Sciences: Transportation Research Board 2021.
  • Authors:
    • Saldivar-Carranza, Enrique
    • Li, Howell
    • Mathew, Jijo
    • Hunter, Margaret
    • Sturdevant, James
    • Bullock, Darcy M
  • Publication Date: 2021-9


  • English

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  • Accession Number: 01764371
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-01472
  • Files: TRIS, TRB, ATRI
  • Created Date: Feb 4 2021 11:00AM