| 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 collect, process, and send traffic images to the center for further analysis and distribution.
- The field element shall return sensor and CCTV system operational status to the controlling center.
- The field element shall return sensor and CCTV system fault data to the controlling center for repair.
Roadway Environmental Monitoring
- The field element shall include surface and sub-surface environmental sensors that measure road surface temperature, moisture, icing, salinity, and other measures.
- The field element shall include environmental sensors that measure weather conditions including temperature, wind, humidity, precipitation, and visibility.
- The field element's environmental sensors shall be remotely controlled by a maintenance center.
- The field element's environmental sensors shall be remotely controlled by a traffic management center.
- The field element shall provide environmental sensor equipment operational status to the controlling center or maintenance vehicle.
- The field element shall provide environmental sensor equipment fault indication to the controlling center or maintenance vehicle.
Roadway Short Range Traveler Information Communications
- The field element shall distribute traveler information including traffic and road conditions to passing vehicles using short range communications, under center control.
- The field element shall distribute advisory information, such as evacuation information, wide-area alerts, incident information, work zone intrusion information, and other special information to passing vehicles using short range communications, under center control.
Roadway Incident Detection
- The field element shall collect, process, and send traffic images to the center for further analysis and distribution.
- The field element shall remotely process video data and provide an indication of potential incidents to the traffic management center.
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.
Roadway Signal Controls
- The field element shall control traffic signals under center control.
- The field element shall respond to pedestrian crossing requests by accommodating the pedestrian crossing.
- The field element shall provide the capability to notify the traffic management center of pedestrian calls and pedestrian accommodations.
- The field element shall report the current signal control information to the center.
- The field element shall report current preemption status to the center.
- The field element shall return traffic signal controller operational status to the center.
- The field element shall return traffic signal controller fault data to the center.
- The field element shall report current transit priority status to the center.
Roadway Traffic Information Dissemination
- The field element shall include dynamic messages signs for dissemination of traffic and other information to drivers, under center control; the DMS may be either those that display variable text messages, or those that have fixed format display(s) (e.g. vehicle restrictions, or lane open/close).
- The field element shall include pedestrian information systems under center control (e.g. warning pedestrians of a potential hazard, or providing mandatory instructions as to the availability of pedestrian access).
- The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center.
Roadway Equipment Coordination
- The field element shall include sensors that provide data and status information to other field element devices, without center control.
Roadway Work Zone Safety
- The field element shall include work zone intrusion detection devices that detect when a vehicle has intruded upon the boundary of a work zone, under center control.
- The field element shall include work zone intrusion alerting devices that alert drivers that they have intruded upon the perimeter of the work zone, or are about to do so; may provide alerts to drivers directly or via in-vehicle signing.
- The field element shall provide operational status for the work zone intrusion detection devices to the maintenance center.
- The field element shall provide operational status for the work zone intrusion alerting devices to the maintenance center.
Roadway Work Zone Traffic Control
- The field element shall collect, process, and send work zone images to the center for further analysis and distribution, under center control.
- Under traffic and maintenance center control, the field element shall include driver information systems (such as dynamic messages signs and highway advisory radios) that advise drivers of activity around the work zone through which they are currently passing.
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 include a local interface that provides operational status and fault data for connected field equipment to field personnel.
Roadside Lighting System Control
- The field element shall control lighting systems along the roadside under center control.
- The field element shall return operational status for the lighting system equipment to the center.
- The field element shall return lighting system equipment fault data to the center for repair.
Roadway Variable Speed Limits
- The field element shall monitor traffic and environmental conditions along the roadway.
- The field element shall autonomously calculate and set variable speed limits based on current conditions by lane.
- The field element shall receive commands from the controlling center that establish speed limits by lane.
Roadway Signal Preemption
Field Management Stations Operation
- The field management station shall accept configuration information from the center.
- The filed management station shall pass data provided by the center to local field devices and report data from the field devices back to the center.
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