An entity is defined in the National ITS Architecture as either a subsystem or terminator. Subsystems are internal to the ITS architecture whereas terminators are at the boundary of the ITS architecture. The groupings below contain the subsystems first followed by the terminators.
ITS Architecture Subsystems
Centers
- Archived Data Management Subsystem (ADMS)
- Commercial Vehicle Administration (CVAS)
- Emergency Management (EM)
- Emissions Management (EMMS)
- Fleet and Freight Management (FMS)
- Information Service Provider (ISP)
- Maintenance and Construction Management (MCMS)
- Toll Administration (TAS)
- Traffic Management (TMS)
- Transit Management (TRMS)
Roadside
- Commercial Vehicle Check (CVCS)
- Parking Management (PMS)
- Roadway Subsystem (RS)
- Security Monitoring Subsystem (SMS)
- Toll Collection (TCS)
Traveler
- None
Vehicle
- Commercial Vehicle Subsystem (CVS)
- Emergency Vehicle Subsystem (EVS)
- Maintenance and Construction Vehicle (MCVS)
- Transit Vehicle Subsystem (TRVS)
ITS Architecture Terminators
Environment
- None
Human
- Parking Operator (X36)
Other System
- None
System
- Alerting and Advisory Systems (X95)
- Archived Data User Systems (X69)
- Event Promoters (X19)
- Financial Institution (X21)
- Intermodal Freight Depot (X60)
- Intermodal Freight Shipper (X01)
- Maintenance and Construction Administrative Systems (X88)
- Media (X27)
- Multimodal Crossings (X29)
- Multimodal Transportation Service Provider (X02)
- Rail Operations (X67)
- Shelter Providers (X97)
- Surface Transportation Weather Service (X77)
- Telecommunications System for Traveler Information (X100)
- Traveler Card (X61)
- Weather Service (X58)