| Functional Requirements: |
Roadway Basic Surveillance
- The field element shall collect, process, digitize, and send traffic sensor data (speed, volume, and occupancy) to the center for further analysis and storage, under center control.
- The field element shall return sensor operational status to the controlling center.
- The field element shall return sensor fault data to the controlling center for repair.
Roadway Freeway Control
- The field element shall include ramp metering controllers, mainline meters, and lane controls for use on freeways, under center control.
- The field element shall monitor operation of ramp meter, mainline meters, and lane control indicators and report to the center any instances in which the indicator response does not match that expected from the indicator control information.
- The field element shall monitor operation of ramp meter, mainline meters, and lane control indicators and report to the center any instances in which the indicator response does not match that expected from known indicator preemptions.
- The field element shall return ramp metering controller, mainline meters, and lane control operational status to the controlling center.
- The field element shall return ramp metering controller, mainline meters, and lane control fault data to the maintenance center for repair.
- The field element shall provide indications to the driver that a freeway ramp or a lane is available for use, with possible usage data for the freeway lanes they are entering.
Roadway Probe Data Communications
- The field element shall communicate with passing vehicles for traffic data link time calculations and send collected data to the controlling center; identification will be removed to ensure anonymity.
- The field element shall communicate with on-board equipment on passing vehicles to collect current vehicle position, speed, and heading and a record of previous events (e.g., starts and stops, link travel times) that can be used to determine current traffic conditions.
- The field element shall communicate with on-board equipment on passing vehicles to collect current status information and a record of previous events (e.g., temperature, wiper status, headlight status, traction control system status) that can be used to determine road and surface weather conditions.
- The field element shall provide roadside equipment operational status to the center.
- The field element shall provide roadside equipment fault indication to the center for repair.
Roadway Signal Controls
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