This document contains a collection of Architecture Flow Diagrams that show all of the data that passes between subsystems. The characteristics and constraints on the inter-subsystem data flows are also presented. The logical and physical architecture are tied together with a collection of cross-reference tables in the Traceability Matrix . The Theory of Operations provides a simple walk-through of how the architecture supports ITS implementations. Advantages and disadvantages of alternative operational concepts are also presented.
Several documents report the results of the numerous evaluations conducted on the architecture.
Because the architecture is not something that one can directly see or touch, the evaluations are based on possible implementations. The Communications Document presents a thorough analysis of the communications aspects of the architecture. Analysis begins with the communications requirements resulting from analysis of the architecture data flows. Quantitative data loading requirements are proposed for a hypothetical system design whose parameters are documented in the Evaluatory System Design . A far reaching technology assessment is presented that covers several potential communications technology choices.