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Determining Required Probe Vehicles for Accurate Urban Travel Time Measurements

This study focuses on identifying the minimum number of probe vehicles needed for reliable travel time estimation in urban networks. It highlights how the type and variance of travel time distribution affect this minimum, alongside the importance of distribution stability. Key factors influencing the number of probes include vehicle count and sensor spacing, with a focus on optimizing these variables to minimize estimation error. The research also delves into data collection methods from probes and detectors to enhance online and offline travel time predictions.

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Determining Required Probe Vehicles for Accurate Urban Travel Time Measurements

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Presentation Transcript

  1. Determination of Number of Probe Vehicles Required for Reliable Travel Time Measurement in Urban Network

  2. Determining the Number of Probe Vehicles for Freeway Travel Time Estimation by Microscopic Simulation

  3. Conclusions • the minimum number of probe vehicles necessary is determined by the type of travel time distribution. • the variance of the distribution would affect the minimum number of probe vehicles needed despite the type of distribution. • the stability of the distribution would also affect the minimum number of probe vehicles necessary.

  4. Factors Affecting Minimum Number of Probes Required for Reliable Estimation of Travel Time

  5. Ideas • Optimize the combination of # of vehicles and sensor spacing • Independent variables: • # of probes • Sensor spacing • Dependent variables: “Error” • How to define “Error”? (variance) • How to relate “Error” to # of probes and Sensor spacing?

  6. Information • Information from probe: • For each probe i, Vi, xi, at any instantaneous time t0 • For each probe i, Tti in time period t0-t1 • Information from detector: • Vt (time mean speed) in the previous short time period t0-t1 • Occ. and Flow • Spacing

  7. Objectives • Online travel time prediction • Offline travel time estimation Data • Simulation • Trajectory

  8. Alternatives:

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