- Harmer E. Davis Transportation Library - Library of the Institute of Transportation Studies at the University of California, Berkeley.
- U.S. Department of Transportation - Oversees federal highway, air, railroad, and maritime and other transportation administration functions; components include the FAA, FHA, FRA, NHTSA, OIG, and STB. Site links to related agencies and organizations, safety resources, and current news.
- The National Transportation Library - Provides online access to documents and databases covering all aspects of transportation in the US. Material comes from public and private organizations and access is free.
- Transportation Safety Board of Canada - Canadian agency responsible for investigating air, marine, rail and pipeline accidents