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Sensors for Traffic Control
An Introduction


Prof. David Bernstein
James Madison University

Computer Science Department
bernstdh@jmu.edu

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What's Needed?
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  • The Desired Data:
    • Presence, Counts
    • Velocity, Flow
    • Headway, Spacing
  • About the Sensors:
    • Some sensors can collect all data directly
    • Some sensors have to be used in pairs to collect some data
    • Some sensors require additional processing to collect some data
Platform
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  • Infrastructure Only:
    • RADAR, LIDAR
    • Inductive Loops, Pneumatic Tubes, Piezoelectrics
    • Camera/Imaging
  • Vehicle + Infrastructure:
    • RFID Tags
    • Other Radio Systems (e.g., Cellular)
Probes
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  • The Idea:
    • A subset of vehicles in a vehcile+infrastructure system that voluntarily provide data
  • Using Government Vehicles:
    • Buses, maintenance vehicles, emergency service vehicles can be used as probes
Spatial and Temporal Characteristics (cont.)
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Point in Space, Point in Time

images/sensor_traffic_point.png
Spatial and Temporal Characteristics (cont.)
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Area of Space, Point in Time

images/sensor_traffic_area.png
Spatial and Temporal Characteristics (cont.)
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Point to Point

images/sensor_traffic_point-to-point.png
There's Always More to Learn
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