2021 Next-Generation National Household Travel Survey – Origin-Destination Data Addendum for the California Region

The 2021 Next-Generation National Household Travel Survey – Origin-Destination Data Addendum for the California Region covers the state of California and 16 counties in surrounding states.

An addendum to the nationwide version of the study conducted in 2021, this regional survey provided additional information and spatial granularity about people’s movements to, from, and within the areas under study.

Data Collection Agency

The survey was produced by the University of Maryland and conducted for the California Department of Transportation.

Survey Methodology

Data were collected in two zones: the core area (census blocks in the state of California) and the halo area (16 counties bordering California in Oregon, Nevada, and Arizona).

All trips were assigned an origin zone and a destination zone, as well as a travel mode, purpose, and distance. Sociodemographic information related to age, income, and gender was also collected.

Survey Records, Data, and Documentation

Survey records include 53,642,241,017 trips.

Records are available in two file types: a shapefile denoting the core and halo areas and a csv file in which each row is a unique combination of each origin-destination zone (excluding trips without a start or end point in California). The number of trips and subsequent data are aggregated to each census block group or county.

How To Cite the Data

If you use TSDC data in a publication, please contact us and include a citation in your publication consistent with the following format:

"Transportation Secure Data Center." [(year)]. National Renewable Energy Laboratory. Accessed [date]: www.nrel.gov/transportation/secure-transportation-data.

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