In Southern California, there are several Intelligent Transportation Systems (ITS) architectures that may be applicable to an ITS project. SCAG has developed a Southern California Regional ITS Architecture that addresses multi-county issues: those projects, programs, and services that require connectivity across county boundaries or are deployed at a multi-county level. Secondly, each County has developed a Regional ITS Architecture to provide a framework for local deployment of ITS applications. A third "layer" is also in place at the state level: the California ITS Architecture and System Plan addresses those services that are rolled out or managed at a state level or are interregional in nature.
SCAG’s Southern California Regional ITS Architecture provides a framework for ITS planning that promotes interoperability and communication across jurisdictional boundaries. Projects developed under a regional framework extend the usefulness of any single project by making information easily accessible for operators and users of the system. The Southern California Regional ITS Architecture is intended to provide a resource for project sponsors and transportation providers that coordinates cross-county planning efforts in the SCAG region and facilitates project development (planning, design, implementation, etc.).
Regional ITS projects, or transportation projects (both highway and transit) with ITS elements, that want to be eligible for Federal transportation funding are required to be consistent with the Southern California Regional ITS Architecture pursuant to 23 CFR 940.9 and 940.11. In addition, such projects must comply with system engineering requirements and applicable Federal standards that have been adopted for the implementation of ITS.