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Click on a Project Inventory element from the list above to view functional requirements.
Collect Traffic Surveillance
- The center shall support an interface with a map update provider, or other appropriate data sources, through which updates of digitized map data can be obtained and used as a background for traffic data.
- The center shall maintain a database of surveillance equipment and sensors and associated data (including the roadway on which they are located, the type of data collected, and the ownership of each )
- The center shall respond to control data from center personnel regarding sensor and surveillance data collection, analysis, storage, and distribution.
- 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 monitor, analyze, and distribute traffic images from CCTV systems under remote control of the center.
- The center shall monitor, analyze, and store traffic sensor data (speed, volume, occupancy) collected from field elements under remote control of the center.
On-board Transit Signal Priority
- The transit vehicle shall prevent a priority request from being sent when the transit vehicle cannot use the priority (e.g., when the transit vehicle makes a passenger stop on the approach to an intersection).
- The transit vehicle shall send the schedule deviation data and status of priority requests to the transit vehicle operator and provide the capability for the transit vehicle operator to control the priority system.
- The transit vehicle shall send priority requests to traffic signal controllers at intersections, pedestrian crossings, and multimodal crossings on the roads (surface streets) and freeway (ramp controls) network that enable a transit vehicle schedule deviation to be corrected.
- The transit vehicle shall determine the schedule deviation and estimated times of arrival (ETA) at transit stops.
Roadway Basic Surveillance
- The field element shall return sensor and CCTV system fault data to the controlling center for repair.
- The field element shall return sensor and CCTV system operational status to the controlling center.
- The field element shall collect, process, and send traffic images to the center for further analysis and distribution.
Roadway Signal Priority
- The field element shall respond to signal priority requests from transit vehicles.
Roadway Traffic Information Dissemination
- The field element shall provide fault data for the driver information systems equipment (DMS, HAR, etc.) to the center for repair.
- The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center.
- 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 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).
TMC Multimodal Coordination
- The center shall exchange information with transit management centers including details current transit routes, the level of service on each route, and the progress of individual vehicles along their routes.
- The center shall respond to requests from transit management centers for signal priority at one or more intersections along a particular transit route.
TMC Signal Control
- The center shall remotely control traffic signal controllers.
- The center shall maintain traffic signal coordination including synchronizing clocks throughout the system.
- The center shall manage boundaries of the control sections used within the signal system.
- The center shall implement control plans to coordinate signalized intersections based on data from sensors.
- 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 collect traffic signal controller fault data from the field.
- The center shall collect traffic signal controller operational status and compare against the control information sent by the center.
TMC Traffic Information Dissemination
- The center shall retrieve locally stored traffic information, including current and forecasted traffic information, road and weather conditions, traffic incident information, information on diversions and alternate routes, closures, and special traffic restrictions (lane/shoulder use, weight restrictions, width restrictions, HOV requirements), and the definition of the road network itself.
- The center shall collect operational status for the driver information systems equipment (DMS, HAR, etc.).
- The center shall remotely control dynamic messages signs for dissemination of traffic and other information to drivers.
Transit Center Signal Priority
- The center shall provide transit operations personnel with the capability to control and monitor transit signal priority operations.
- The center shall define business rules that govern use of transit vehicle signal priority, communicate these rules to the transit vehicle, and monitor transit vehicle requests for priority at signalized intersections.
- The center shall send requests for priority along routes or at intersections to traffic management.
- The center shall analyze transit vehicle schedule performance to determine the need for priority along certain routes or at certain intersections.
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