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)
- Roadway Subsystem (RS)
- Security Monitoring Subsystem (SMS)
Traveler
- Personal Information Access (PIAS)
Vehicle
ITS Architecture Terminators
Environment
- None
Human
- None
Other System
- None
System
- Alerting and Advisory Systems (X95)
- Archived Data User Systems (X69)
- Asset Management (X79)
- Maintenance and Construction Administrative Systems (X88)
- Map Update Provider (X23)
- Multimodal Crossings (X29)
- Multimodal Transportation Service Provider (X02)
- Rail Operations (X67)
- Surface Transportation Weather Service (X77)
- Telecommunications System for Traveler Information (X100)
- Weather Service (X58)