Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

 Find the latest Coronavirus-related transportation statistics on the BTS COVID-19 landing page.

United States Department of Transportation United States Department of Transportation

Table 8. Independent and Dependent Model Variables

Dataset Table:

Dependent Variable Independent Variables 1
(as estimated from model with NHTS and ACS data) (from 2012-2016 American Community Survey 5-year estimates) 2
Person miles traveled, Percent of 2 person households 3
Person trips, Percent of 3 person household 4
Vehicle miles traveled, or Percent of 4 or more person household 5
Vehicle trips Percent of 1 vehicle available 6
Percent of 2 vehicles available 7
Percent of 3 vehicles available 8
Percent of 4 or more vehicles available 9


Census tracts are the unit of observation. Percent of one person households and percent of households with zero vehicles available are the omitted indicator variables.