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Administrator's Fact Book (FAA)
Overview of traffic, financial, infrastructure data
General Aviation and Part 135 Activity Surveys (FAA)
Traffic, conditions and equipment
Highway Statistics (FHWA)
Vehicles, drivers, miles of roadway, fuel, finance, and vehicle miles (annual)
Toll facilities data (FHWA)
Statistics on toll bridges, tunnels, highways and ferries in the US
Freight Facts and Figures 2011 (FHWA)
Volume and value of freight shipments, the extent of the network, employment and productivity, and related safety, energy use, and environmental effects.
DOT Maritime Data Working Group (USDOT)
Links to sources.
Navigation Data Center (US Army Corps of Engineers)
Data on ports and locks, domestic waterborne freight