United States Department of Transportation
i
Optimizing Vehicle Trajectories at Fixed-Time Traffic Signal Intersections using Cooperative Driving Automation (CDA)
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2023-12-01
[PDF-1.43 MB]
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Abstract:Automated vehicles communicating with smart traffic signals can travel through signalized intersections more safely and efficiently. The functionality developed in this project demonstrates CDA’s potential to benefit automated vehicles by supporting them as they navigate signalized intersections with fixed-time settings. As shown in figure 1, vehicles approaching an intersection may share status and intent information (such as the vehicle’s current location and speed, the intended future path, etc.) with a roadside unit (RSU) and receive signal phase and timing (SPaT) inputs from the traffic signals connected to the RSU once in range. SpaT inputs communicate to the vehicle current phase and interval for the traffic light and how much time remains at that interval. The vehicle can then determine how best to proceed based on the intervals. Vehicles can automatically adjust and smooth their trajectory to minimize their stopping times by reducing their speed ahead of a yellow light change. They can also pass through an intersection during a green interval with a higher speed, within designated limits. This technology allows for smoother transitions through intersections, better flowing traffic patterns, fewer delays, less energy consumption, and less backward shock-wave propagation.
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