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people who live 2 miles away from transit. Thus, the specific location of the clusters can determine the types of travel collected.) Because it is more difficult to reach individual respondents by telephone, the recall window was expanded to 6 days beyond travel day. While switching to a telephone survey resolved the problems with sample clustering and sample size, the 1990 NPTS trip rates (expressed as daily person trips per household) were still well-below those obtained by Metropolitan Planning Organizations in their household travel surveys. This had been a problem throughout the data series, and it would be solved in the 1995 survey. 1995 – A major change in the 1995 survey was the use of a travel diary for collecting daily trips. While the travel diary corrected the previously-described problem of trip rates, it necessitated a switch to a two-stage data collection. The two-stage data collection, combined with the increase in survey burden and the increase in telemarketing over time, resulted in a much lower response rate than previously obtained in the NPTS. Another significant change in the 1995 survey was changing the standard for a household to be included in the dataset. The previous requirement was that one or more household members had to complete the person interview for the household to be considered complete. In 1995, this was changed to 50% or more of the household adults (18+) had to be interviewed for the household to be included in the dataset. 2001 NHTS – The 2001 survey represented a combined survey of the NPTS and the ATS (American Travel Survey). The ATS, which had been conducted in 1995 by BTS, was a survey of trips of 100 miles or more taken over the course of a calendar year. There were problems in trying to use the 1995 NPTS and the 1995 ATS together to form a picture of total household travel by the American public. The combined survey approach for the 2001 NHTS was designed to give one data source for the full continuum of person travel. 1-13
In addition to a combined survey, the threshold for longer trips was lowered to 50 miles or more, to obtain a better sample of those often overlooked 50-100 mile trips. For the first time in the NPTS series, travel was collected for household members 0-4 years old. All previous surveys had collected travel only from household members age 5 and older, on the dated assumption that those 0-4 only made trips with other household members. However, this ignored trips of this young group made with day care providers, as part of a preschool activity, or just with non-household members. Great care was taken in the 2001 NHTS to resolve some of the response rate issues that surfaced in the 1995 survey. Westat, the survey contractor, initiated a number of successful actions to stop the decline in response rates. More detail on each of the surveys in the NPTS/NHTS series is contained in Appendix O. In addition to changes in the survey design and administration, a host of real world factors affected the 2001 NHTS, as described in the following section. 1-D.2. FACTORS AFFECTING COMPARABILITY TO PREVIOUS SURVEYS Certain factors, such as the state of the economy and the price of oil are known to have significant effects on how, when, and the amount that people travel. Variations in these factors are expected and are often accounted for in travel trend analysis. However, during the 2001 NHTS data collection period, which was from March 2001 through May 2002, several extraordinary events occurred that undoubtedly affected travel in the United States. The first occurred on September 11, 2001, when terrorists attacked the World Trade Center Towers in New York and the Pentagon near Washington, D.C. using four commandeered commercial aircraft. The attacks, and the intense security measures imposed on commercial air travel and major transportation facilities of all types that followed, severely disrupted travel in the United States for months, changing the amount and modes of travel during that period. The second series of events occurred during the period from mid-September through mid-November 2001, when letters containing anthrax were sent to various recipients in Florida, New 1-14
Page 1 and 2: 2001 NATIONAL HOUSEHOLD TRAVEL SURV
Page 3 and 4: TABLE OF CONTENTS (continued) 2-D.8
Page 5 and 6: TABLE OF CONTENTS (continued) 6-C.
Page 7 and 8: TABLE OF CONTENTS (continued) LIST
Page 9 and 10: USER’S GUIDE This guide includes
Page 11 and 12: These data are collected for: • a
Page 13 and 14: • information on each household v
Page 15 and 16: 1.C.2. WHEN WAS THE SURVEY CONDUCTE
Page 17 and 18: Exhibit 1-1. Changes Over Time in t
Page 19: The 1969 questionnaire was very sho
Page 23 and 24: CHAPTER 2. SURVEY CONTENT AND INTER
Page 25 and 26: As in the Wisconsin add-on, the adv
Page 27 and 28: Exhibit 2-1. Household Interview Co
Page 29 and 30: • the interviewer was told that t
Page 31 and 32: Exhibit 2-2. Person Interview Conte
Page 33 and 34: Exhibit 2-3. Contents of the Odomet
Page 35 and 36: 5. Driver status - items C8, C13 an
Page 37 and 38: 6. Overnight stops, transportation
Page 39 and 40: include additional questions to det
Page 41 and 42: 2-E. TYPICAL NHTS HOUSEHOLD 2-E.1.
Page 43 and 44: Person Interview - Amy completed he
Page 45 and 46: Person Interview continued with Amy
Page 47 and 48: 2-E.7. TYPICAL NHTS HOUSEHOLD: THAN
Page 49 and 50: 3-A.2. HOW THE DATA WERE COLLECTED
Page 51 and 52: 3-B.2. SAMPLING FRAME Westat’s sa
Page 53 and 54: 3-C.3. INTERVIEWER MONITORING Inter
Page 55 and 56: 3-C.8. ADVANCE LETTER AND CASH INCE
Page 57 and 58: • An eye-catching bright yellow r
Page 59 and 60: • if a travel diary was completed
Page 61 and 62: 3-D.2. UPDATING CATI DURING DATA CO
Page 63 and 64: 3-D.3. APPROACH TO POST INTERVIEW E
Page 65 and 66: thus were recorded on a "Missed Tri
Page 67 and 68: In addition to missed trips reporte
Page 69 and 70: member at all times on the trip. If
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Table 3-1. Number of Completed Hous
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8. During the editing process, cert
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Exhibit 3-1. Changes in the 2001 NH
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CHAPTER 4. SURVEY RESPONSE RATES We
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Table 4-1. Weighted Household Respo
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Table 4-2. Weighted Person Response
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5-A. HOUSEHOLD WEIGHTS 5-A.1. INITI
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A final step was to “trim” very
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5-C. PERSON TRIP WEIGHTS FOR TRAVEL
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CHAPTER 6. DESCRIPTION OF DATA FILE
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6-B. RELATIONSHIP BETWEEN THE FOUR
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In earlier NHTSs, before “stayed
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Exhibit 6-2. Contents of the 2001 N
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NQR (No match with 1995) Indicates
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6-E. DERIVED VARIABLES Over 239 der
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7-A. TRAVEL CONCEPTS 7-A.1. OVERVIE
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Contact information for user suppor
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7-D.2. WHICH WEIGHT TO USE There ar
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Tables 7-2 and 7-3 provide the vari
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vehicles that would have been obtai
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7-G.2. ID NUMBERS Each unit (e.g. h
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The variables HOUSEID and PERSONID
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NHTS Listing of All Variables By Al
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NHTS Household File Codebook Public
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NHTS Person File Codebook Public Us
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NHTS Vehicle File Codebook Public U
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NHTS Day Trip File Codebook Public
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NHTS Long Trip File Codebook Public
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The SAS System 2001-2002 National H
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APPENDIX D DERIVED VARIABLES This a
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year. Provided by EIA. 14. CDIVMSAR
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31. DRVR_P1 to DRVR_P14*: Indicates
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59. GSCOST: Fuel cost estimated in
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05 Variable HH_RACE5 (C7) is yes (N
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104. IMPTAGE: Subject's age (AGE (C
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16-21 group. 4. If household member
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133. NBIKETRP*: The variable was ob
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calls to the household. Deliver in
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11, 2001. Derived from variable TDA
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201. VEHOWNMO: How long the vehicle
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220. WKSTFIPS: State FIPS Code for
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APPENDIX E ABBREVIATIONS, TRAVEL CO
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egardless of the number of persons
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GLOSSARY HOW TO COMPUTE - The four
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Employed A person is considered emp
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4. Pickup Truck. A pickup truck is
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Passenger For a specific trip, a pa
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or to participate in a sport. 17. R
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Worker See “Employed”. 1. Autom
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Table 1. Full Sample Household Cont
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Table 2. Full Sample Person Control
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Table 3. National Sample Household
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Table 4. National Sample Person Con
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Table 5. Control Totals for Checkin
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APPENDIX G STANDARD TABLES AND LOGI
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Table 1: Number of Households, By F
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Table 3: Number of Persons in House
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Table 4: Number of Drivers, by Annu
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Table 5: Number of Workers, By MSA
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Table 7: Average Number of Travel D
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Table 9: Number of Travel Day Vehic
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Table 12: Average Vehicle Occupancy
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2 = Median Home Value between Q1 an
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Household Size (1, 2, 3, 4 or more)
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H-2. VARIABLES USED TO DEFINE NONRE
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Home Ownership - (Owner/Renter) - H
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• Numbers that are in-scope. Tele
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Survey Research Organizations (CASR
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identical to the person interview c
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Table I-4. Classification of Househ
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useable household person interview
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APPENDIX J METHODS TO ESTIMATE ANNU
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Table J-1. Lag Time between Two Odo
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Table J-2. 2001 NHTS Sample Vehicle
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Table J-3. NHTS Vehicles 1 by Data
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Odometer2 − Odometer1 VMTJuly2001
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these 48 percentages was used as a
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J-5. ESTIMATION METHODS Six differe
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Approach 3. For vehicles with self-
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J-6. SCREENING OF BESTMILE ESTIMATE
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Consistently to the data quality ch
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APPENDIX K ESTIMATION METHODOLOGIES
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The estimation of these statistics
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adequacy of shortfall adjustments h
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MPG(EPA 55/45) denotes the composit
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MPG MPG i(on i(on - road, EPA city)
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household is in the South, otherwis
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m mpg c ij = ij , ∀ j = 1, 2, …
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expenditures, Ei, was estimated by
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January 2004 Version were set to
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Table 3. Number of Vehicles, Vehicl
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Table 4. United States per Vehicle-
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Peugeot 44 H-42 Lada 69 H-56 Porsch
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MAKE: Alfa Romeo (Cont.) (31) (ALFA
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MAKE: Audi (Cont.) (32) (AUDI) Code
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MAKE: Buick (18) (BUIC) Codes AUTOM
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MAKE: Chevrolet (Cont.) (20) (CHEV)
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MAKE: Chevrolet (Cont.) (20) (CHEV)
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MAKE: Chrysler/DaimlerChrysler (Con
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MAKE: Dodge (07) (DODG) Codes Model
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MAKE: Eagle* (10) (EGIL) Codes AUTO
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MAKE: Ford (Cont.) (12) (FORD) Code
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MAKE: Ford (Cont.) (12) (FORD) Code
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MAKE: GMC (Cont.) (23) (GMC ) Codes
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MAKE: Honda (Acura: See “54”) (
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MAKE: Isuzu (Cont.) (38) (ISU ) Cod
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MAKE: Lancia (40) (LINCI) Codes AUT
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MAKE: Lincoln (Cont.) (13) (LINC) C
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MAKE: Mercedes Benz (Cont.) (42) (M
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MAKE: Mercury (Merkur: See “56”
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MAKE: Mitsubishi (Cont.) (52) (MITS
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MAKE: Oldsmobile (Cont.) (21) (OLDS
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MAKE: Plymouth (Cont.) (09) (PLYM)
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MAKE: Pontiac (Cont.) (22) (PONT) C
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MAKE: Saturn (24) (STrN) Codes AUTO
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MAKE: Suzuki (53) (SUZI) Codes MOTO
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MAKE: Triumph (50) (TRIU) Codes AUT
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MAKE: Volvo (51) (VOLVO) Codes AUTO
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MAKE: Other Import (69) Codes AUTOM
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MAKE: BSA (70) (BSA ) Codes Model I
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Codes Model Includes Model Years Bo
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MAKE: Freightliner (Cont.) (82) (FR
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MAKE: International Harvester/ Navi
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MAKE: Iveco/Magirus* (Cont.) (88) (
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MAKE: Gillig (92) Codes Model Inclu
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MAKE: Other Make (Cont.) (98) Codes
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APPENDIX M 2001 NHTS QUESTIONNAIRE
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SECTION B: VEHICLE DATA PROGRAMMER
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PROGRAMMER NOTE: SET SCRN.VEHICNT.
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C3. (C8) Including yourself, how ma
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PROGRAMMER NOTE: DO NOT ALLOW SCRES
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C10. (SC20) Going back to the ages
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IF OTHRPHON = 0, GO TO BOX BEFORE D
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D3. (D4) To whom should we address
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D8. (D6) Travel patterns are affect
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NATIONAL HOUSEHOLD TRAVEL SURVEY Te
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E4. (N_F1A) Last week, did {you/SUB
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SEGMENT WORK E10. (N_F4) Transporta
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E13. (N_F4B) Would you please provi
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E16. (N_F7) How did {you/SUBJECT} u
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E18. (N_F8A) How many people, inclu
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G4. (N_G11A) Let’s continue with
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PROGRAMMER NOTE: VERIFY IF PREVIOUS
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PROGRAMMER NOTE: START TIME FOR FIR
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G19. (N_G20) Did {you/SUBJECT} use
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G22. (MPO3) {What is the name of th
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G25B. (N_G212) [Now I have a few qu
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G26. (N_G22) {Now I have a few ques
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G26E. (N_G217) [Now I have a few qu
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G27E. (N_G217) What was {your/his/h
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G33. (N_G26OV) Which one? (PUBTYPE)
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G35. (N_G27A) How did {you/SUBJECT}
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G38. (N_G28A) How did {you/SUBJECT}
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PROGRAMMER NOTE: IF (G41 (N_G29A))
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G45. (N_G32) Which household member
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PROGRAMMER NOTE: FOR HHM ENTERED IN
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H1. (H2_4) {What was the farthest c
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SECTION I: FARTHEST TRIP DETAIL PRO
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I5. What type of transportation did
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I8. What type of transportation did
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I11. After {you/s(he)} arrived at t
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PROGRAMMER NOTE: ALLOW INTERVIEWERS
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I15. What type of transportation di
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SECTION J: OVERNIGHT STOPS ROSTERIN
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J3. Tell me all the types of transp
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PROGRAMMER NOTE: IF K2 (G2) MRTMTH
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K7. (T2) In what month did {you/SUB
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PROGRAMMER NOTE: IN L2 (N_E1A-D), A
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PROGRAMMER NOTE: IF L5 (N_E2) YEARM
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PROGRAMMER NOTE: IF THE VEHICLE IS
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L11. (N_E8) In the past two months,
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M5. (N_K5D) How long {have you/has
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PROGRAMMER NOTE: RANGE FOR M10 (N_K
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SEGMENT SCRN M13. (K6) In surveys l
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M22. (K15) Does this include income
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M28. (K21) Was {your/his/her} incom
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N3. (ODVERF) [RECORD THE ODOMETER M
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SECTION B: VEHICLE DATA BINTRO El p
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SECTION C: PERSON DATA FOR EACH HOU
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C8. (S7A THROUGH S7H ) Por favor d
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C16. (C5) ¿Cuántos de estos {OTHR
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D5. (D3) Para poder enviarle a uste
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D11. (D9) Le enviaremos a usted {la
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E3 (N_F1) Durante la mayoría de la
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E10. (N_F4) Quienes planean la tran
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E15. (N_F6) La semana pasada, ¿cu
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E17. (N_F8) La semana pasada, ¿{us
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G6. (N_G9A) ¿Anotó {usted/SUBJECT
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G14. (N_G17) ¿En qué fecha hizo {
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G22. (MPO3) {¿Cuál es el nombre d
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G25C. (N_G214) [Ahora tengo unas cu
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G26B. (N_G212) {Ahora tengo unas cu
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G27A. (N_G211) ¿Cuál fue la razó
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G31. (N_G26) ¿Cuál vehículo? (VE
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G35. (N_G27A) ¿De qué manera lleg
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G38. (N_G28A) ¿Cómo llegó {usted
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G44. (N_G31) ¿Había algún miembr
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SEGMENT - TRIP SECTION H: FARTHEST
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SEGMENT - TRIP SECTION I: FARTHEST
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I6. ¿Quién era el chofer? (¿Qui
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I9. ¿Cómo se llamaba el/la {aerop
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I12. Dígame todos los tipos de tra
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I15. ¿Qué tipo de transportación
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SEGMENT - STAY SECTION J: OVERNIGHT
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J3. Dígame todos los tipos de tran
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K4. (G3) ¿Cuál fue la ciudad y es
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SEGMENT GTRV SECTION L: GENERAL TRA
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L3. (N_E9) En la última semana, ¿
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L9. (N_E5) En los últimos 12 meses
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SEGMENT TRAV SECTION M: INTERNET US
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M8. (N_K5F) ¿Nació {usted/SUBJECT
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SEGMENT SCRN M13. (K6) En encuestas
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M23. (K16) ¿El ingreso de quién n
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SEGMENT VEHI SECTION N: COLLECTION
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27. Morpace: Cover letter sent with
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N-4
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N-6
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N-8
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N-10
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NATIONAL HOUSEHOLD TRAVEL SURVEY In
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ENCUESTA NACIONAL DE TRANSPORTE EN
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N-16
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NHTS 2001 Odometer Mileage Form For
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NHTS 2001 Odometer Mileage Form Tha
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ID - 14959963 PHONE: (---) ___ - __
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National Household Travel Survey Re
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16. Who was that? NATIONAL HOUSEHOL
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N-28 National Household Are you con
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Dear Participating Household: Are y
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Dear Kentucky Traveler: Are you con
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OMPO Oahu Metropolitan Planning Org
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NATIONAL HOUSEHOLD TRAVEL SURVEY TR
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ENCUESTA NACIONAL DE TRANSPORTE EN
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Record ALL trips taken on: Please k
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PHONE NUMBER: (__ __ __) __ __ __ -
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PHONE NUMBER: (__ __ __) __ __ __ -
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PHONE NUMBER: (__ __ __) __ __ __ -
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PHONE NUMBER: (__ __ __) __ __ __ -
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PHONE NUMBER: (__ __ __) __ __ __ -
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PHONE NUMBER: (__ __ __) __ __ __ -
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PHONE NUMBER: (__ __ __) __ __ __ -
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APPENDIX O COMPARABILITY WITH EARLI
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1990 NPTS Research Triangle Institu
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• feasibility of collecting more
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Exhibit O-1. 2000 NHTS Pretest Desi
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APPENDIX P DATA EDITING Section 3-D
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24. Review cases where E1=1 and res
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NTIMES, 3) Calculating the number o
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VARIABLE NAMING SCHEME The variable
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Urban/Rural Continuum - Distributio
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