This page will take you to a number of highly regarded international research databases. The Transport Advice Portal aims to give users links to all of the relevant documentation. For international research rather than replicate existing databases, TAP will provide a link to all relevant databases.
If there are any databases that you are aware of that are not listed below then please send details to firstname.lastname@example.org
Transportation Research Board of the National Academies
International Research Transport Documentation
Association for European Transport
Social Research in Transport Clearinghouse
World Transit Research