| Functional Area: 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 collect, digitize, and send multimodal crossing and high occupancy vehicle (HOV) lane sensor data to the center for further analysis and storage.
- 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.
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| Functional Area: 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's environmental sensors shall be remotely controlled by weather service providers such as the National Weather Service or value-added sector specific meteorological services.
- The field element's environmental sensors shall be remotely controlled by a maintenance and construction vehicle.
- 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.
- The field element shall remotely aggregate environmental sensor data with environmental data collected from maintenance and construction vehicles.
- The field element shall provide weather and road surface condition data to centers.
- The field element shall provide weather and road surface condition data to maintenance and construction vehicles.
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| Functional Area: Roadway Traffic Metering |
- The field element shall regulate the flow of traffic on ramps, interchanges, and the mainline, under center control.
- The field element shall monitor operation of ramp, interchange, and mainline meters and report to the center any conflicts between received control plans and current system operation.
- The field element shall return ramp, interchange, and mainline meter operational status to the controlling center.
- The field element shall provide indications to the driver that the metering system is active and provide safe transitions between active and inactive status.
- The field element shall return ramp, interchange, and mainline meter fault data to the maintenance center for repair.
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| Functional Area: Roadway HOV Control |
- The field element shall include sensors to detect high-occupancy vehicle (HOV) lane usage, under center control.
- The field element shall include driver information systems to notify users of lane status for lanes that become HOV or High Occupancy Toll (HOT) lanes during certain times of the day on freeways, under center 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.
- The field element shall collect a count of vehicle occupants from passing vehicles using field-vehicle communications.
- The field element shall provide traffic flow measures and information regarding vehicle occupancy (i.e., lane usage) in HOV lanes to the center.
- The field element shall return operational status for the HOV lane sensors to the controlling center.
- The field element shall return fault data for the HOV lane sensors to the center for repair.
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| Functional Area: 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.
- The field element's video devices shall be remotely controlled by a traffic management center.
- The field element shall provide operational status and fault data for the incident detection devices to the traffic management center.
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| Functional Area: 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.
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| Functional Area: 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 driver information systems that communicate directly from a center to the vehicle radio (such as Highway Advisory Radios) for dissemination of traffic and other information to drivers, under center control.
- 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.
- The field element shall provide fault data for the driver information systems equipment (DMS, HAR, etc.) to the center for repair.
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| Functional Area: Roadway Equipment Coordination |
- The field element shall include sensors that provide data and status information to other field element devices, without center control.
- The field element shall include sensors that receive configuration data from other field element devices, without center control.
- The field element shall include devices that provide data and status information to other field element devices without center control.
- The field element shall include devices that receive configuration data from other field element devices, without center control.
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| Functional Area: 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.
- The field element shall display the current speed limits per lane to drivers.
- The field element shall display additional information such as basic safety rules and current traffic information to drivers.
- The field element shall collect operational status of the variable speed limit field equipment and report the operational status to the controlling center.
- The field element shall monitor and report faults to the controlling center.
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| Functional Area: Roadway Dynamic Lane Management and Shoulder Use |
- The field element shall measure traffic conditions per lane, under center control.
- The field element shall determine how to change the lane controls to respond to current traffic and road conditions.
- The field element shall receive lane management control information from the controlling center.
- The field element shall provide guidance and information to drivers regarding current lane configuration and status.
- The field element shall monitor vehicle characteristics and classify individual vehicles.
- The field element shall collect vehicle profile information from individual vehicles using field-vehicle communications.
- The field element shall monitor current lane usage to determine if vehicles are complying with current lane use restrictions.
- The field element shall capture vehicle information, including vehicle image(s) of vehicles violating current lane usage restrictions and report violations to the controlling center.
- The field element shall monitor operational status of the dynamic lane control equipment and report operational status to the controlling center.
- The field element shall identify and report fault conditions to the controlling center.
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| Functional Area: Roadway Warning |
- The field element shall monitor for hazardous traffic conditions, including queues.
- The field element shall monitor for hazardous road surface and local weather conditions.
- The field element shall monitor for debris, animals, or other objects in the travel lanes.
- The field element shall provide collected sensor data to the controlling center.
- The field element shall autonomously identify potentially hazardous conditions and activate warning signs to approaching motorists.
- The field element shall receive commands from the controlling center that activate warning signs to approaching motorists.
- The field element shall collect operational status of the warning system field equipment and report the operational status to the controlling center.
- The field element shall monitor and report faults to the controlling center.
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