| 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 known indicator preemptions.
- 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 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.
- 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 return ramp metering controller, mainline meters, and lane control operational status to the controlling center.
Roadway Equipment Coordination
- 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 provide data and status infor
- 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 f
- 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
- The field element shall include sensors (such as traffic, environmental, and work zone intrusion detection sensors) that receive control information from other field element devices, without center control.
Field Barrier System Control
- The field element shall activate barrier systems for transportation facilities and infrastructure under center control. Barrier systems include automated or remotely controlled gates, barriers and other systems that manage entry to roadways.
- The field element shall communicate access permission status and access instructions to approaching vehicles using field-vehicle communications.
- The field element shall grant access only to qualified vehicles.
- The field element shall receive requests for access from approaching vehicles using field-vehicle communications and validate and authenticate the requests.
- The field element shall return barrier system fault data to the maintenance center for repair.
- The field element shall return barrier system operational status to the controlling center.
Roadway Field Device Monitoring
- The field element shall include a local interface that allows field personnel to command diagnostic tests on connected field equipment.
- The field element shall include a local interface that provides operational status and fault data for connected field equipment to field personnel.
- 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
- The field element shall send collected fault data to the maintenance center for repair.
- The field element shall send operational status of connected field equipment to the maintenance center.
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