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National Transportation Library: ROSA P (Repository & Open Access Science Portal)
Includes "resources across all modes of transportation and related disciplines, with specific focus on information produced by USDOT, state DOTs, and other transportation organizations. Content types found in ROSA P include textual works, datasets, still image works, moving image works, other multimedia, and maps."
Transportation Statistics Annual Report
"Describes the Nation’s transportation system, the system’s performance, its contributions to the economy, and its effects on people and the environment."
Aimed at providing "one stop shopping" for transportation data. Explore by mode, subject, or agency. Includes a Mapping Center for viewing and analyzing data geographically. From the U.S. Bureau of Transportation Statistics.