| Functional Requirements: |
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 HOV Control
- The field element shall include freeway control devices, such as ramp signals and mainline metering and other systems associated with freeway operations that control use of HOV lanes, under center control.
Roadway Reversible Lanes
- The field element shall monitor traffic in reversible lanes, including wrong-way vehicles, using sensors and surveillance equipment under center control.
- The field element shall include automated reversible lane equipment and driver information systems (such as lane control signals) that control traffic in reversible lanes on surface streets, under center control.
- The field element shall include automated reversible lane equipment and driver information systems (such as lane control signals) that control traffic in reversible lanes on freeways, under center control.
- The field element shall provide operational status for the reversible lane field equipment to the center.
- The field element shall provide fault data for the reversible lane field equipment to the center.
Roadway Equipment Coordination
- The field element shall include sensors (such as traffic, environmental, and work zone intrusion detection sensors) that provide data and status information to other field element devices (such as dynamic message signs, ramp meters, traffic signals, work zone intrusion alert systems), without center control.
- The field element shall include devices (such as arterial or freeway controllers, roadway automated treatment systems, barrier and safeguard systems, emissions or pollution systems, and work zone intrusion alert systems) that receive control information from other field element devices, without center control.
Roadway Field Device Monitoring
- The field element shall monitor the operational status (state of the device, configuration, and fault data) of connected sensors (such as traffic, infrastructure, environmental, security, speed) and devices (such as highway advisory radio, dynamic message signs, automated roadway treatment systems, barrier and safeguard systems, cameras, traffic signals, ramp meters, short range communications equipment, security surveillance equipment).
- The field element shall send operational status of connected field equipment to the maintenance center.
- The field element shall send collected fault data to the maintenance center for repair.
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