NHTS Data Center
Citation
To recognize the valuable role of National Household Travel Survey (NHTS) data in the transportation research process and to facilitate repeatability of the research, users of NHTS data are asked to formally acknowledge the data source. Where possible, this acknowledgement should take place in the form of a formal citation, such as when writing a research report, planning document, on-line article, and other publications. The citation can be formatted as follows:
U.S. Department of Transportation, Federal Highway Administration, 2009 National Household Travel Survey. URL: http://nhts.ornl.gov.
2009 NHTS - Version 2.1, February 2011
Also see 2009 Publications for documentation.
Datasets
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS Windows Binary (.sas7bdat) | 102 | 674 |
| SAS Transport | 98 | 598 |
| DBase .dbf | 93 | 990 |
| ASCII .csv | 104 | 621 |
Replicate Weights
| Description | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| Replicate Weights | 532 | 934 |
Roster File
| Description | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| Roster file in SAS Windows binary format, Proc Format source code, and documentation. | 3 | 40 |
Trip Chaining
| Description | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| Trip Chaining datasets in SAS Windows binary format. Also see the documentation, the handout, and the 1995/2001 Trip Chaining datasets. | 30 | 200 |
Source Code
| Title | Description |
|---|---|
| Formats.sas | SAS PROC FORMAT library |
2001 NHTS - Version 4.0, July 2005
Datasets
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS Transport | 63 | 434 |
| DBase .dbf | 66 | 672 |
| ASCII .csv | 61 | 445 |
Replicate Weights
| Description* | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| Household-level Weights | 92 | 112 |
| Person-level Weights | 408 | 514 |
| Long Trip File Weights | 74 | 94 |
| * For analysis of the Vehicle file, use the household-level replicate weight. For analysis of the Travel Day file, use the person-level replicate weight multiplied by 365. See Users Guide sections 7-D and 7-E for additional information. | ||
Trip Chain Datasets* for 2001 NHTS and 1995 NPTS
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS | 80 | 646 |
| * For additional information, see the Trip Chaining handout | ||
Source Code
| Title | Description |
|---|---|
| Formats.sas | SAS PROC FORMAT library |
| Import.sas | Provides example source code to import the contents of the SAS transport file |
2001 NHTS Transferability National Files
Transferring 2001 National Household Travel Survey (ORNL report) [PDF]
Datasets
| Description | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| Transferability statistics by Tract, CSV format | 120 | 280 |
| Example Tract spreadsheet, Excel 2003 XML format | - | - |
| Transferability statistics by TAZ, CSV format | 4 | 20 |
| Example TAZ spreadsheet, Excel 2003 XML format | - | - |
1995 NPTS
Datasets
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS Transport | 33 | 229 |
| DBase .dbf | 30 | 236 |
| ASCII .csv | 30 | 237 |
Trip Chain Datasets* for 2001 NHTS and 1995 NPTS
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS | 80 | 646 |
| * For additional information, see the Trip Chaining handout | ||
Source Code
| Title | Description |
|---|---|
| Formats.sas | SAS PROC FORMAT library |
| Import.sas | Provides example source code to import the contents of the SAS transport file |
| se.shtml | SAS macro to calculate standard errors |
1990 NPTS
Datasets
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS Transport | 9 | 67 |
| ASCII .csv | 10 | 82 |
Travel Day with Adjusted Weights*
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS | 6 | 57 |
| * For additional information, see the Summary of Travel Trends, Appendix 3 | ||
1983 NPTS
For additional information including introduction, glossary of terms, Users Guide, reports, and SAS datasets see the FHWA 1983 NPTS Web site.
Datasets
| File Format | Download Size (MB) | Installed Size (MB) |
|---|---|---|
| SAS Transport | 3 | 39 |
Source Code
| Title | Description |
|---|---|
| Import.sas | Provides example source code to import the contents of the SAS transport file |