- National Transportation Safety Boardwww.ntsb.gov
- U.S. Department of Transportationwww.transportation.gov
- Federal Motor Carrier Safety Administration (FMCSA) Regulationswww.fmcsa.dot.gov
- Bureau of Transportation Statistics (BTS)www.bts.gov
- U.S. Customs and Border Protection (Small Business Outreach)www.cbp.gov
