Skip navigation to main content.
NREL - National Renewable Energy Laboratory
About NRELEnergy AnalysisScience and TechnologyTechnology TransferTechnology DeploymentEnergy Systems Integration

Transportation Secure Data Center

Illustration of a variety of vehicles surrounding a globe and lock, representing the Transportation Secure Data Center.

The TSDC features detailed transportation data for all modes of travel.

The Transportation Secure Data Center (TSDC) provides free access to detailed transportation data from a variety of travel surveys and studies conducted across the nation. While preserving the privacy of survey participants, this repository makes vital transportation data broadly available to users from the comfort of their own desks via a secure online connection.

Maintained by NREL in partnership with the U.S. Department of Transportation and the U.S. Department of Energy, this centralized repository relieves individual agencies from the burden of fielding numerous data-access requests and provides additional features such as linked reference layers, summary statistics, and data-set comparisons.

Transportation Data

The TSDC features second-by-second GPS readings for millions of miles of travel, along with vehicle characteristics and survey participant demographics. NREL screens the initial data for quality control, translates each data set into a consistent format, and interprets the data for spatial analysis. NREL processing routines join data points to the road network and add information related to vehicle fuel economy and road grade.

If you use TSDC data in a publication, please include a citation, reference, or credit to NREL [e.g., "Transportation Secure Data Center." (2014). National Renewable Energy Laboratory. Accessed January 15, 2014: www.nrel.gov/tsdc.] and notify us when you publish.

Cleansed Data Access

Users may quickly access cleansed data from the following studies to support applications that require detailed travel distance and speed information, but not detailed latitude and longitude spatial information. Before viewing the data for the first time, you will be required to fill out a short registration form.

Spatial Data Access

Users may also access spatial information and other data details through a restricted “secure portal environment” after completing an application and approval process by filling out these application forms and submitting them (along with a note indicating how you learned about the TSDC) via email to tsdc@nrel.gov. The data dictionaries available alongside the downloadable cleansed data sets include information about the parameters of the secure portal environment.

After receiving a log-in account, users may remotely connect to the environment, which prohibits removal of sensitive data. However, the provided software tools and reference data allow users to create specialized database queries, perform detailed calculations, and conduct statistical and geographic information system (GIS) analyses. Users may also request to have custom files or programs loaded for them, and to have aggregated results or reports sent directly to them.

More Information

The following resources provide more information about the Transportation Secure Data Center:

Contacts

Contact us to discuss options for joining as a Transportation Secure Data Center partner, to apply for spatial data clearance, or for more information about the project.

Subscribe for periodic e-mail updates when new data sets and features become available in the TSDC.