Transportation Secure Data Center
The Transportation Secure Data Center (TSDC) provides free access to detailed transportation data from a variety of travel surveys and studies. 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, data filtering, road grade and road network matching, summary statistics, and data set comparisons.
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, link U.S. Census and other spatial data layers, and add information such as road grade.
Cleansed Data Access
Users may quickly access cleansed data from the following studies to support applications that require detailed travel distance and/or 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.
- California Department of Transportation — 2010–2012 California Household Travel Survey
- U.S. Department of Transportation — 2011 Tolling Impact Survey (Atlanta and Seattle)
- Atlanta Regional Commission — 2011 Regional Travel Survey
- Texas Department of Transportation — 2002–2011 Regional Travel Surveys
- Metropolitan Council — 2010 Travel Behavior Inventory (Minneapolis/St. Paul)
- Chicago Metropolitan Agency for Planning — 2007 Regional Household Travel Inventory
- Puget Sound Regional Council — 2004–2006 Traffic Choices Study
- Mid-America Regional Council — 2004 Regional Travel Study (Kansas City)
- Southern California Association of Governments — 2001–2002 Regional Travel Survey
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 via email to firstname.lastname@example.org. The data dictionaries available alongside the downloadable cleansed data sets include information about the variables available in 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 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.
How to Cite the Data
If you use TSDC data in a publication, please notify us and include the following citation in your publication: "Transportation Secure Data Center." (2015). National Renewable Energy Laboratory. Accessed January 15, 2015: www.nrel.gov/tsdc.
The following resources provide more information about the Transportation Secure Data Center:
- Archiving Data from New Survey Technologies: Lessons Learned on Enabling Research with High-Precision Data while Preserving Participant Privacy conference paper
- TSDC: Real-World Data for Planning, Modeling, and Analysis fact sheet
- TSDC: Data Application Examples webpage
- Map Matching and Real-World Integrated Sensor Data Warehousing presentation
- TSDC Demonstration webinar
- TSDC Project and Procedures Overview webinar
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.