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Exhibit 1-1. Changes Over Time in the NPTS/NHTS Data Series (continued) Sample Year 1995 NPTS 1995 ATS Sample Size (households) 42,033 (21,000 national and 21,033 addons) 2001 69,817 useable househ olds (26,038 national and 43,779 addons) Sample Selection - list-assisted sample of telephone numbers formed a Random Digit Dialing (RDD) sample - sample was stratified by 70 geographic units 80,000 PSU’s – outgoing panels of Census’ Current Population Survey list-assisted sample of telephone numbers formed a Random Digit Dialing (RDD) sample Interview Method(s) telephone interviews telephone and personal visit telephone interviews Number of Contacts two – one interview at the household level, one for each person in the household four-panel survey with 4 waves occurring 3 months apart two – one interview at the household level, one for each person in the household Contractor Research Triangle Institute, Research Triangle Park, North Carolina Bureau of Census Westat Rockville, MD (completed 54,937 interviews in the National sample and 2 add-ons); Morpace, Farmington Hills, MI (completed 14,880 interviews in 7 addons) Travel Day Data (memory/ diary) travel diary used travel diary used travel diary used 1-11 Travel Period Definition all trips of 75 miles or more with a return home during the 14 days preceding and including the travel day all trips of 100 miles or more during a 1 year period all trips of 50 miles or more with a return home during the 28 days preceding and including travel day Unique Attributes - first time for a 2-stage survey using a travel diary - trip rates increased considerably because of the travel diary - completed household definition changed to 50% or more of household adults - household rostering of trips (ability to confirm trips previously reported by another household member) - first time cash incentives were used - first time odometer readings were collected - panel design of 4 wave interviews over a 1 year data collection period - trips of 100 miles of more, excluding commute trips - first time the long trip survey (American Travel Survey) was combined with the daily trip survey (NPTS) - threshold for long trips was lowered to 50 miles to collect more trips in the previously ignored 50-75 mile range - if no long trips taken during travel period, most recent trip of 50 miles or more was collected - walking trips increased considerably because of multiple prompts in the questionnaire - cash incentives used in both the pre-interview letter and with the travel diary mailing - multiple data collection methods for odometer readings Response Rate 37.2% (112,960 eligible and presumed eligible residential telephone numbers, 42,033 household completing) 85% (68,000 households) 28.6% (217,063 eligible and presumed eligible residential telephone numbers in full sample, 69,817 households completing) Add-Ons New York State Commonwealth of Massachusetts Oklahoma City, OK Tulsa, OK None Baltimore, MPO Des Moines, MPO Hawaii Kentucky (4 counties) Lancaster PA, MPO New York State Oahu (Honolulu MPO) Texas Wisconsin
The 1969 questionnaire was very short and to the point, while the 1977 questionnaire was long and detailed. Much of the detail added in 1977 was information on long trips (travel period trips). The focus on long trips in 1977 was further reinforced by the fact that a part of the NPTS sample was also interviewed for the National Travel Survey (NTS.) The NTS was a survey of long-distance trips (100+ miles) taken over the course of a full year. Note that 1977 marked the last national long-distance trip survey until 1995, when BTS (the Bureau of Transportation Statistics) resurrected this data series as the American Travel Survey. The other major difference between the 1969 and 1977 surveys was that the focus on auto travel in 1969 was broadened to vehicle travel by 1977, reflecting the greater mix of vehicle types in the household-based fleet. 1983 – Like the 1969 and 1977, the 1983 survey was conducted as a faceto-face interview by Census Bureau field staff, using a retired PSU-based sample from the Current Population Survey. However, either because of the smaller sample size of 6,500 households or the economic conditions during the survey period, the 1983 data is acknowledged as an anomaly in the NPTS series, with trip and travel data believed to be too low. Another issue inherent to the 1983 dataset is that, given the low sample size, each Census field interviewer only conducted 2-3 NPTS interviews a month. It seemed that this was too low a threshold to maintain proficiency with a complex questionnaire like NPTS. All three of the Census-administered surveys had used a four-day recall window beyond travel day. That is, the person-level interview must be completed within 4 days after travel day for the interview to be included. 1990 – The 1990 NPTS represented a switch to a private survey research firm, Research Triangle Institute, and to a telephone sample. The interviews were conducted using CATI (Computer-Assisted Telephone Interviewing) which allows for some on-line editing as the data is collected. A non-clustered random-digit dialing sample was used, which could better represent travel throughout the country. (Clustered samples are problematic for household travel surveys because the nature of some mode choices is highly dependent on very small geographic areas. For example, people who live within a half-mile of public transit will use it considerably more than 1-12
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: Exhibit 1-1. Changes Over Time in t
Page 21 and 22: In addition to a combined survey, t
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
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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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