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FHWA

The NHTS Add-on Program

States and MPOs have the unique opportunity to purchase samples of the household travel survey when it is conducted, approximately every five to seven years. These additional samples, along with random national samples collected in the Add-on area, are compiled into a cleaned geocoded database ready for application to local planning and forecasting. Trips of all lengths, for all purposes, and for all modes are collected.

Deliverables

  • Edited, weighted data
  • O-D geocodes for all trips
  • Odometer readings
  • All modes including transit, walk, and bike
  • Documentation and User's Guide
  • Web-based retrieval system

Benefits

  • No contracting or oversight hassles
  • Economies of scale
  • Contractors coordinated centrally
  • SP&R and PL funds can be used
  • High data quality, low risk
  • Consistent Local and National data

2017 Add-on Partners

Examples of Add-on Research

Category Title Link
Bike and Pedestrian Studies Non-Motorized Travel: Analysis of the 2009 NHTS California Travel Survey Add-On Data Estimating Total Miles Walked and Biked by Census Tract in California Compendium
Policy and Mobility The Effect of Urban Form on Residential Relocation and Non-work Travel Patterns: A Case of Florida Households Compendium
Special Population Groups Travel Behavior of Largest Minority Cohorts in Texas Compendium
Survey, Data Synthesis, and Other Applications Trip Purpose Estimation for Urban Travel in the U.S.: Model Development, NHTS Add-on Data Analysis, and Model Transferability Across Different States Compendium
Survey, Data Synthesis, and Other Applications Add-On Program for National Household Travel Survey: Experience of Stakeholders and Best Practices to Maximize Program Benefits Compendium
Survey, Data Synthesis, and Other Applications Quantifying Key Errors in Household Travel Surveys: Comparison of Random Digit-Dial Survey and Address-Based Survey Compendium
Survey, Data Synthesis, and Other Applications Add-On Program for National Household Travel Survey Compendium
Survey, Data Synthesis, and Other Applications Microsimulation of Household Travel Survey Data Compendium
Traffic Safety Revisiting exposure: Fatal and non-fatal traffic injury risk across different populations of travelers in Wisconsin, 2001-2009 Compendium
Traffic Safety National Household Travel Survey Add-On Program: Experience of Stakeholders and Best Practices for Maximizing Program Benefits Compendium
Travel Behavior Modeling intra-household interactions in the generation of social-recreational tours Compendium
Travel Behavior Household/Zonal Socioeconomic Characteristics And Tour Making: Case Of Richmond/Tri-Cities Model Region In Virginia Compendium
Travel Behavior Integrated Analysis of Workers' Physically Active Activity and Active Travel Choice Behavior Compendium
Travel Behavior Walking and Biking in California: Analysis of the CA-NHTS Compendium
Travel Behavior Evansville Travel Model Update 2011, Model Development and Validation Report Compendium
Travel Behavior Wisconsin Passenger and Freight Statewide Model: Case Study in Statewide Model Validation Compendium
Trend Analysis and Market Segmentation Investigating the Neighborhood Effect on the Hybrid Vehicle Adoption Compendium
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Developed by the CTA, ORNL under funding from the FHWA