2017 National Household Travel Survey

The average car carried 1.54 people in 2017 while the average SUV carried 1.84 people according to the just-released National Household Travel Survey (NHTS). That’s down slightly from 2009, when it was 1.59 and 1.92 respectively. Historically, auto occupancies have declined in parallel with the decline in household and family sizes; the 2009 survey reported a rare increase but the 2017 decline is not surprising.

The “explore data” button on the NHTS home page allows users to construct a huge variety of data tables. For example, I created a table showing miles of driving per driver by household income and urban area size. Annual miles of driving were roughly the same for all levels of income above $35,000 per year. In smaller urban areas, only people in households with incomes below $15,000 per year did significantly less driving, while people in households with incomes more than $150,000 did a little more driving. Variations by urban area size were small, though large urban areas with heavy rail had about 13 percent less driving than large urban areas without heavy rail; probably that result is driven by New York City.

Vehicle occupancies varied widely by trip purpose, ranging from 1.18 for work trips to 2.57 for recreation trips. However, occupancies seem to be independent of income.
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Driving by density shows that people drive less at higher densities, but it takes a lot of density to have a large impact on per-capita driving. Increasing densities from 1,000-2,000 per square mile to 10,000-25,000 per square mile — in other words, by around ten times — reduces driving by 19 percent per driver. While the number of drivers per capita may be slightly lower in denser areas, you still end up with several hundred percent more miles of driving per square mile.

With more than 100 different variables, it’s possible to make tens of thousands of two-way tables and millions of three-way tables. Not all will be useful, of course, but many will be. If you are a data junkie like the Antiplanner, you should enjoy this site.

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About The Antiplanner

The Antiplanner is a forester and economist with more than fifty years of experience critiquing government land-use and transportation plans.

2 Responses to 2017 National Household Travel Survey

  1. LazyReader says:

    The average SUV carried 1.84, problem with averaging stuff is you end up with fractions and decimals a lot. It’s more likely the typical car is for you, where as the SUV satiate the need for people who have commutes with others involved, namely the Kids. It’s not to say that SUV’s don’t attract single individuals especially the expensive ones or the land yachts. An small SUV has five seats, a car has five seats, but the justification for the SUV was probably children and cargo in mind; thats the “U” after all, Utility. Whether it’s a cheap SUV like a Ford Escape or an expensive SUV like a Porsche Cayenne. With 160-240 hp Ford or the Cayenne with it’s 250-500 hp. But the SUV will typically buck the trend of averages when it comes to occupancy, namely because of the principal motivation for it’s purchase………..Hauling; not timber or cargo or hay……….but your life (sports equipment, science projects, briefcases, groceries, dry cleaning, furniture, appliances)

    Vehicle occupancy’s are varied namely by the variability in urban areas of women in the workforce Full time, they need their own car to get around. That’s the real reason occupancy has declined, The two car family.

  2. C. P. Zilliacus says:

    LazyReader wrote:

    Vehicle occupancy’s are varied namely by the variability in urban areas of women in the workforce Full time, they need their own car to get around. That’s the real reason occupancy has declined, The two car family.

    Some years ago, I recall reading that according to research, the U.S. demographic group with the highest overall vehicle occupancy were persons classified as Hispanic.

    This may well still be correct.

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