CTA maintains geographically-based representations of the North American transportation
infrastructure suitable for individual modal or multimodal studies. The
major components of this data system are analytic link-node networks designed
primarily to support routing, traffic, investment, and reliability applications.
However, their geographic bases also allow cartographic applications and
the association of auxiliary environmental or economic data that are geolocated.
The three networks that are well documented and available below for open distribution
are the Oak Ridge National Highway Network, the CTA Rail Network, and the composite
Intermodal Transportation Network. However, CTA also uses customized versions
of various waterway, global seaways, airways, and boundary datasets, and combines
them in multimodal networks.
These datasets are in the public domain.
• North American Administrative Boundaries
Intermodal Terminals Database
Phone: (865) 946-1352