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KY 4/22 Module 1a Purposes of Data Collection

KY 4/22 Module 1a Purposes of Data Collection. Review of initial handouts. Travel Survey Manual, TMIP, USDOT and EPA, 1996 Travel Survey Manual Appendices, includes sample RFPs Travel Survey Course CD TRB Committee on Travel Survey Methods (A1D10) reports page.

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KY 4/22 Module 1a Purposes of Data Collection

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  1. KY 4/22 Module 1aPurposes of Data Collection

  2. Review of initial handouts • Travel Survey Manual, TMIP, USDOT and EPA, 1996 • Travel Survey Manual Appendices, includes sample RFPs • Travel Survey Course CD • TRB Committee on Travel Survey Methods (A1D10) reports page

  3. Main differences between 1996 and TODAY • Greater use of computers for data entry at all stages • Greater use of GPS • Future implementation of E911 with GPS in cellular phones • Continuing decline in response rates • Population sub-groups who rely solely on cellular phones.

  4. Data collection purposes • Travel Demand Models • Demographic characteristics not avail from other data sources • Trend analysis • Borrowing data (transferability)?

  5. Data collection purposes • Travel demand models • Trip Generation Rates • Trip Length Frequency Distribution • Model validation and calibration • Mode choice models (FTA New Starts) • Vehicle acquisition models

  6. Demographic Characteristics not always avail from other sources • Volume counts, passenger counts do not include characteristics such as: • Vehicle ownership • Household income • Household size

  7. Trend Analysis • Daily weekday person trip rates • Driver licensing • VMT

  8. 1969-2001 NHTS trends

  9. Annual Miles Per Driver

  10. Significantly more households in 2001 where there are more vehicles than there are drivers. 2001 1995 14.5 million 15 million 64.5 million 63 million 20 million 14 million 2.8 million 1.4 million Source: Patricia Hu, ORNL. Jan 2003

  11. Borrowing Data/Transferability • Primary data collection can be expensive. Sometimes you need to borrow data. • NCHRP 365 (NCHRP 187) • NPTS Transferability Pilot • “Quick Response”

  12. Maybe you decide that primary data collection necessary • Let’s try some now.

  13. Fill out a Travel Diary • Your assigned travel day is : Thursday, April 17 • Need a volunteer to tabulate: • Average # of person trips per day • Average # of vehicles per driver (in households)

  14. Constraints to Data Collection • Three-legged stool • Quality • Quantity • Cost

  15. What’s the hardest part of primary data collection? • What do you think?

  16. What’s the hardest part of primary data collection? • Elaine’s opinion: • Getting the budget for the project • Response rates and potential sample bias • Reporting geographic information

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