National Transportation Library - and the integrated search
TranStats Intermodal Transportation Database - searchable index of over 100 transportation-related data bases across every mode of transportation
National Transportation Statistics
{http://www.tsa.gov/travelers/index.shtm|TSA for Travelers] - everything a travel needs to know about security-related requirements on public transportation
UUHS-HLDI:Crash testing and Highway Safety - {Insurance Institute for Highway Safety & Highway Loss Data Institute}- motor vehicle ratings, news, research, statistics, laws and regulations pertaining to automobile and highway safety