In the context of sustainable transportation systems, previous studies have either focused only on the transportation system or have\r\nnot used a methodology that enables the treatment of incomplete, vague, and qualitative information associated with the available\r\ndata.This study proposes a system of systems (SOS) and a fuzzy logic modeling approach. The SOS includes the Transportation,\r\nActivity, and Environment systems. The fuzzy logic modeling approach enables the treatment of the vagueness associated with\r\nsome of the relevant data. Performance Indices (PIs) are computed for each system using a number of performance measures. The\r\nPIs illustrate the aggregated performance of each system as well as the interactions among them. The proposed methodology also\r\nenables the estimation of a Composite Sustainability Index to summarize the aggregated performance of the overall SOS. Existing\r\ndata was used to analyze sustainability in the entire United States. The results showed that the Transportation and Activity systems\r\nfollow a positive trend, with similar periods of growth and contractions; in contrast, the environmental system follows a reverse\r\npattern. The results are intuitive and are associated with a series of historic events, such as depressions in the economy as well as\r\npolicy changes and regulations
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