Functions are a description of WHAT the system has to do. In the architecture, functions are defined at several different levels. Each inventory element is mapped to one or more physical objects from ARC–IT. The general descriptions associated with these physical objects identify functionality in a very general sense. At the next level of detail, most of the ITS elements have been mapped to one or more "Functional Objects" that provide additional functional detail. At the most detailed level, each functional object includes several specific Functional Requirements that more precisely specify the functions to be performed. All three levels of detail are available on this web site. The subsystems and functional objects that are associated with the regional ITS architecture are listed in the table below. Each table entry is a link to more detailed descriptions and functional requirements.

SubsystemFunctional Area
Archived Data SystemArchive Data Repository
Archive Government Reporting
Emergency Management CenterEmergency Call–Taking
Emergency Dispatch
Emergency Routing
Emergency Vehicle OBEEV On–Board En Route Support
EV On–Board Incident Management Communication
ITS Roadway EquipmentRoadway Automated Treatment
Roadway Basic Surveillance
Roadway Data Collection
Roadway Field Device Support
Roadway Signal Control
Roadway Signal Preemption
Roadway Speed Monitoring and Warning
Roadway Traffic Information Dissemination
Roadway Work Zone Traffic Control
Maint and Constr Management CenterMCM Automated Treatment System Control
MCM Vehicle Maintenance Management
MCM Vehicle Tracking
MCM Winter Maintenance Management
Maint and Constr Vehicle OBEMCV Environmental Monitoring
MCV Roadway Maintenance and Construction
MCV Vehicle Location Tracking
MCV Vehicle System Monitoring and Diagnostics
MCV Winter Maintenance
Traffic Management CenterTMC Signal Control
Transit Management CenterTransit Center Connection Protection
Transit Center Data Collection
Transit Center Fare Management
Transit Center Fixed–Route Operations
Transit Center Operator Assignment
Transit Center Paratransit Operations
Transit Center Security
Transit Vehicle OBETransit Vehicle On–Board Fare Management
Transit Vehicle On–Board Maintenance
Transit Vehicle On–Board Paratransit Operations
Transit Vehicle On–Board Trip Monitoring
Transit Vehicle Passenger Counting
Transit Vehicle Security