Click on a Project Inventory element from the list above to view functional requirements.
Collect Traffic Surveillance
- The center shall monitor, analyze, and store traffic sensor data (speed, volume, occupancy) collected from field elements under remote control of the center.
- The center shall monitor, analyze, and distribute traffic images from CCTV systems under remote control of the center.
- The center shall monitor, analyze, and store multimodal crossing and high occupancy vehicle (HOV) lane sensor data under remote control of the center.
- The center shall distribute road network conditions data (raw or processed) based on collected and analyzed traffic sensor and surveillance data to other centers.
- The center shall respond to control data from center personnel regarding sensor and surveillance data collection, analysis, storage, and distribution.
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, 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 fault data to the controlling center for repair.
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 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 provide traffic flow measures and information regarding vehicle occupancy (i.e., lane usage) in HOV lanes 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 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.
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.
TMC HOV Lane Management
- The center shall remotely control sensors to detect high-occupancy vehicle (HOV) lane usage.
- The center shall remotely control freeway control devices, such as ramp signals and mainline metering and other systems associated with freeway operations that control use of HOV lanes.
- The center shall collect traffic flow measures and information regarding vehicle occupancy (i.e., lane usage) in HOV lanes.
- The center shall collect operational status for the freeway control devices associated with HOV lane control.
- The center shall collect fault data for the freeway control devices associated with HOV lane control for repair.
TMC Regional Traffic Management
- The center shall exchange traffic information with other traffic management centers including incident information, congestion data, traffic data, signal timing plans, and real-time signal control information.
- The center shall exchange traffic control information with other traffic management centers to support remote monitoring and control of traffic management devices (e.g. signs, sensors, signals, cameras, etc.).
TMC Reversible Lane Management
- The center shall remotely control devices to detect traffic in reversible lanes, including wrong-way vehicles.
- The center shall monitor the use of reversible lanes and detect wrong-way vehicles in reversible lanes using sensor and surveillance information, and the current lane control status (which direction the lane is currently operating).
- The center shall remotely control automated reversible lane equipment and driver information systems (such as lane control signals) that control traffic in reversible lanes on surface streets.
- The center shall remotely control automated reversible lane equipment and driver information systems (such as lane control signals) that control traffic in reversible lanes on freeways.
- The center shall collect operational status for the reversible lane field equipment.
- The center shall collect fault data for the reversible lane field equipment and send to the maintenance center for repair.
- The center shall provide the capability for center personnel to control access and management of reversible lane facilities, including the direction of traffic flow changes during the day, especially between the peak hours and dedication of more lanes to the congestion direction during special events.
TMC Signal Control
- The center shall accept notifications of pedestrian calls.
- The center shall collect traffic signal controller operational status and compare against the control information sent by the center.
- The center shall collect traffic signal controller fault data from the field.
- The center shall manage (define, store and modify) control plans to coordinate signalized intersections, to be engaged at the direction of center personnel or according to a daily schedule.
- The center shall remotely control traffic signal controllers.
TMC Traffic Information Dissemination
- The center shall remotely control dynamic messages signs for dissemination of traffic and other information to drivers.
- The center shall remotely control 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.
- The center shall collect operational status for the driver information systems equipment (DMS, HAR, etc.).
- The center shall collect fault data for the driver information systems equipment (DMS, HAR, etc.) for repair.
- The center shall distribute traffic data to maintenance and construction centers, transit centers, emergency management centers, and traveler information providers.
TMC Traffic Metering
- The center shall remotely control systems to manage use of the freeways, including ramp, interchange, and mainline metering.
- The center shall collect operational status from ramp meters, interchange meters, and mainline meters and compare against the control information sent by the center.
- The center shall collect fault data from ramp meters, interchange meters, and mainline meters.
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