US Department of Transportation Federal Highway Administration The National Household Travel Survey Heather Contrino US Department of Transportation Federal Highway Administration

About the NHTS… Only national data source on travel demand and travel behavior of the American public. Measures travel by US households for all modes and all purposes Survey conducted since 1969

NHTS uses a classic travel diary as a memory jogger… At the beginning of my travel day (4:00 a.m.) I was:  Home  Some other place WHERE did you go? (Name of place) What TIME did you start and end each trip? WHY did you go there? HOW did you travel? How FAR was it? Started at: Arrived at: (blocks or miles) EXAMPLE: West Park Theater 2:00 p.m. 2:55 p.m. To see a movie walk, bus, walk 6 miles 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

And obtains trips from one address to another by all modes…

Linkage between people, NHTS Core Data Content Households Persons Geography Vehicles Trips Major Contribution Linkage between people, travel and vehicles

2008 NHTS provides trends over 40 years of core content…

New 2008 NHTS Content Congestion Safety Energy and Environment Interstate use and tolling Telecommuting – opportunity and frequency Work arrival time and flexibility Safety Safe Travel to School Travel impacts of disability Energy and Environment Shopping by Internet and deliveries to the household Hybrid/Alternative fuel vehicles Fuel costs by vehicle type and travel behavior Intermodalism Access, egress, and travel party size Frequency of walk and bike Motorcycle ownership and use

2008 NHTS Travel Data for 150,000 Households The NHTS Program National Study Serves the department, congress, and administration Resource for State and metropolitan areas (MPOs) and transportation community 40 years of trend data on U.S. travel behavior Sample size of 25,000 households Add-On Program Service to States and MPOs since 1990 Allows States and MPOs to purchase additional samples for their local area Program participation has doubled every survey year (Sample size of 125,000 households for 2008) 2008 NHTS Travel Data for 150,000 Households

2008 Add-On Program 125,000 Add-On Samples Vermont DOT South Dakota DOT Wisconsin DOT New York State DOT Cedar Rapids, IA Iowa DOT Omaha, Nebraska Indiana DOT California DOT Virginia DOT Tennessee DOT North Carolina DOT Piedmont Region Maricopa, AZ South Carolina DOT Pima, AZ Georgia DOT Texas DOT Florida DOT

2008 NHTS Schedule April 2009 - Data collection completed June 2009 - Final unweighted data for QA August 2009 - Add-On GIS files August 2009 – Draft final weighted file for QA October 2009 – Final weighted data and documentation Add-Ons receive final data January 2009 – Public use data set On-line analysis tool available for 2008 March 2009 – Final full documentation and users guide

How can NHTS help you?

Identifying Trends in Demand Huge growth in travel since 1969, however demand (number of trips) has leveled off over the past decade Base: NHTS data series, travelers 16+

Understanding Mode Use Purpose Distribution of Transit Trips Source: 2001 NHTS

For interpreting and using JTW looking at mode loyalty:

Measure how access impacts behavior… Source: NHTS series since 1969

Quantify the link between demographics and mobility This is the daily range of travel for a high income African American This is the daily range of travel for a low-income African American

And demographics and safety… Base: NHTS data on driver miles by age and FARS fatalities

See how the transportation system works together Source: 2001 NHTS

And when and why people drive 2,000 4,000 6,000 8,000 10,000 12,000 14,000 1 2 3 4 5 6 7 8 9 10 11 12 Start Hour Person Trips in Millions Commute Fam/Pers (inc. Shop) School/Ch Soc/Rec

To look at changes in the fleet mix… Hybrid/Alternative Fuel Vehicles by State Source: NHTS 2008 preliminary

And forecast future demand Estimated on current VMT/person from NHTS and Census population forecast

How other areas use the NHTS…

Safety Planning - California Pedestrian Fatalities per Mile of Exposure I will now highlight some current and future uses of NHTS at the state level. Source: 2001 FARS pedestrian Fatalities and NHTS 2001 miles walked

Model Calibration - Wisconsin HBW Observed Vs Predicted Trip Length Frequency NHTS is a vital component in validating home based work trip length distributions by time of day. Typically model based distributions are modeled against NHTS based observed distributions. Note that NHTS provides HBW, NHB, HBO. Source: 2001 NHTS Bruce Aunet, WI DOT & Cambridge Systematics Inc.

Vehicle Starts, Trip Lengths by Time of Day and Vehicle Utilization Air Quality - New York Vehicle Starts, Trip Lengths by Time of Day and Vehicle Utilization New York uses NHTS data by examining cold starts and hot starts by time of day to estimate Carbon Monoxide and Heavy Metals emissions. New York used NHTS in a variety of ways. Some uses are: Metropolitan Level Analysis reports Compare metro areas in New York. Comparison Studies Are New York State residents different from those elsewhere with respect to personal mobility? To what extend do the travel patterns of New York State residents skew the overall patterns in the state? Do New York State residents outside of New York City travel differently from the rest of the nation? Source: 2001 NHTS

Trip Length Distribution Performance Measures - Virginia Mode Trip Length Distribution Trips by time of day Source: 2001 NHTS

Special Studies - Florida Hurricane Evacuation Planning Weekend and Holiday Travel Planning Event Planning Seasonal Resident Impact

NHTS Products State Profiles Policy Briefs Trends Database Transferability On-line Analysis Tool Risk Assessment Tool AAA Traffic Safety Foundation NHTS Trends CD-ROM

Accessing NHTS Products Contact Heather Contrino, FHWA State Profiles Policy Briefs: http://ornl.gov/publications.shtml#issueBriefs Trends Database: To be posted soon Transferable data for trip generation http://fmip.ornl.gov/nhts/ Risk Assessment Tool: http://www.aaafoundation.org/trafficSTATS/ On-line Analysis Tool: http://nhts.ornl.gov SAS Data Set: http://nhts.ornl.gov/download.shtml

Thank You! Heather Contrino Heather.Contrino@dot.gov

Future Program Goals Methods Periodicity Relevant Content Coverage and Response Rates Cellular phones and non-contacts Periodicity Real time reporting environment Continuous study design/annual reporting Relevant Content Establishing regular, reliable performance measures Maintaining trends while addressing new policy and planning questions