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BTS Home > Programs > National Household Travel Survey > Pre and Post 9 11 Data Documentation
Printable Version

Appendix A - Codebook

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VARIABLE Question Number 1995 Variable Comparison TYPE LENGTH FORMAT LABEL Person pre-9/11 variable Person post-9/11 variable Long distance trip pre-9/11 variable Long distance trip post-9/11 variable
ACC_FLAG I5*   Char 2 $YES_NO Access place-airport/bus terminal     LD_PRE LD_PST
ACCDIV *   Char 2 $CEN_DIV Access place (to far dest)-Census div     LD_PRE LD_PST
ACCMDOB     Num 8 YES_NO Charter/school/other bus- to airport/terminal     LD_PRE LD_PST
ACCMDOT     Num 8 YES_NO Intercity/other train- to airport/terminal     LD_PRE LD_PST
ACCMDOTH     Num 8 YES_NO Other means- to airport/terminal     LD_PRE LD_PST
ACCMDPOV     Num 8 YES_NO Personal vehicle- to airport/terminal     LD_PRE LD_PST
ACCMDPTB     Num 8 YES_NO Public transit bus- to airport/terminal     LD_PRE LD_PST
ACCMDSHP     Num 8 YES_NO Ferry/boat/ship- to airport/terminal     LD_PRE LD_PST
ACCMDSHT     Num 8 YES_NO Shuttle/limo- to airport/terminal     LD_PRE LD_PST
ACCMDSUB     Num 8 YES_NO Subway/commuter train- to airport/terminal     LD_PRE LD_PST
ACCMDTXI     Num 8 YES_NO Taxi- to airport/terminal     LD_PRE LD_PST
ACCMDWLK     Num 8 YES_NO Walking- to airport/terminal     LD_PRE LD_PST
ACCMOD21 I8*   Char 2 $MODEB Trans used: start to access place-1     LD_PRE LD_PST
ACCMOD22 I8*   Char 2 $MODEB Trans used: start to access place-2     LD_PRE LD_PST
ACCMOD23 I8*   Char 2 $MODEB Trans used: start to access place-3     LD_PRE LD_PST
ACCMODE1 I8   Char 2 $MODE Det trans used: start to access place-1     LD_PRE LD_PST
ACCMODE2 I8   Char 2 $MODE Det trans used: start to access place-2     LD_PRE LD_PST
ACCMODE3 I8   Char 2 $MODE Det trans used: start to access place-3     LD_PRE LD_PST
ACCMSA *   Char 4 $MSA Access place (to far dest)-PMSA/MSA/CMSA     LD_PRE LD_PST
ACCREG *   Char 2 $CEN_REG Access place (to far dest)-Census region     LD_PRE LD_PST
ACCST I9   Char 2 $STATE Access place (to far dest)-State     LD_PRE LD_PST
AGERANGE C10 NQR Char 2 $YES_NO HH member 18 years or older PER_PRE PER_PST    
BEGTRAV *   Char 6   Beginning date of travel period     LD_PRE LD_PST
BEGTRIP H1*   Char 6   Beginning date of trip (YYYYMM)     LD_PRE LD_PST
BORNINUS M8 NQR Char 2 $YES_NO Respondent was born in U.S. PER_PRE PER_PST    
CARRODE E18 NQR Num 8 CARRODE Number of people in work carpool PER_PRE PER_PST    
CDIVMSAR * NQR Char 2 $CDIVMSA HHs by Census div., MSA size, rail PER_PRE PER_PST LD_PRE LD_PST
CENSUS_D * Y Char 2 $CEN_DIV Household Census division PER_PRE PER_PST LD_PRE LD_PST
CENSUS_R * Y Char 2 $CEN_REG Household Census region PER_PRE PER_PST LD_PRE LD_PST
CNTTDTR * NQR Num 8   Cnt of trav day pers trips for this resp PER_PRE PER_PST    
CNTTPTR H1*   Num 8 MISSING Cnt of trav period pers trips- this resp PER_PRE PER_PST    
CNTTPUNQ H1*   Num 8 MISSING Number of unique travel period trips PER_PRE PER_PST    
COMMDRVR E8* NQR Char 2 $YES_NO Commercial driver PER_PRE PER_PST    
COMMUTE I13*   Char 2 $YES_NO Trip purpose was to commute?     LD_PRE LD_PST
CONDNIGH M6C NQR Char 2 $YES_NO Med cond limits driving to daytime PER_PRE PER_PST    
CONDPUB M6E NQR Char 2 $YES_NO Med cond limits use of public trans PER_PRE PER_PST    
CONDRIDE M6B NQR Char 2 $YES_NO Med cond results in asking for rides PER_PRE PER_PST    
CONDRIVE M6D NQR Char 2 $YES_NO Med cond requires giving up driving PER_PRE PER_PST    
CONDSPEC M6F NQR Char 2 $YES_NO Med cond requires special transport PER_PRE PER_PST    
CONDTRAV M6A NQR Char 2 $YES_NO Med cond results in less travel PER_PRE PER_PST    
DIARYCMP G2* Y Char 2 $YES_NO Was diary completed PER_PRE PER_PST    
DIFFDATE * Y Num 8 MISSING Days between trav day and person int. PER_PRE PER_PST    
DISTBLOC E14* NQR Num 8 MISSING Distance to work if reported in blocks PER_PRE PER_PST    
DISTTOWK E14* Y Num 8 MISSING Distance to work in miles PER_PRE PER_PST    
DRIVER C8* SD Char 2 $DRIVER Driver status of respondent PER_PRE PER_PST LD_PRE LD_PST
DRVRCNT C8* Y Num 8   Count of drivers in HH PER_PRE PER_PST LD_PRE LD_PST
DTACDT L2K NR Char 2 $DT Worrying about a traffic accident PER_PRE PER_PST    
DTCONJ L2A NR Char 2 $DT Highway congestion PER_PRE PER_PST    
DTDISTRC L2H NQR Char 2 $DT Distracted drivers PER_PRE PER_PST    
DTDRUNK L2G NQR Char 2 $DT Drunk drivers PER_PRE PER_PST    
DTGAS L2B NQR Char 2 $DT Price of gasoline PER_PRE PER_PST    
DTNOWALK L2C NQR Char 2 $DT Lack of walkways or sidewalks PER_PRE PER_PST    
DTPVPOT L2E NQR Char 2 $DT Rough pavement or potholes PER_PRE PER_PST    
DTRRAGE L2F NQR Char 2 $DT Aggressive drivers on the road PER_PRE PER_PST    
DTSPEED L2I NQR Char 2 $DT Drivers speeding PER_PRE PER_PST    
DTTIEUP L2D NR Char 2 $DT Traffic or road congestion PER_PRE PER_PST    
DTTRUCKS L2J NQR Char 2 $DT Number of large trucks on road PER_PRE PER_PST    
EDITRECU *   Char 1 $YES_NO RECURR imputed. 1:Yes, 0:No     LD_PRE LD_PST
EDUC M7 Y Char 2 $EDUC Highest Education Level PER_PRE PER_PST LD_PRE LD_PST
EGR_FLAG I5*   Char 2 $YES_NO Egress place-airport/bus terminal     LD_PRE LD_PST
EGRDIV *   Char 2 $CEN_DIV Egress place (to far dest)-Census div     LD_PRE LD_PST
EGRMDOB     Num 8 YES_NO Charter/school/other bus- from airport/terminal     LD_PRE LD_PST
EGRMDOT     Num 8 YES_NO Intercity/other train- from airport/terminal     LD_PRE LD_PST
EGRMDOTH     Num 8 YES_NO Other means- from airport/terminal     LD_PRE LD_PST
EGRMDPOV     Num 8 YES_NO Personal vehicle- from airport/terminal     LD_PRE LD_PST
EGRMDPTB     Num 8 YES_NO Public transit bus- from airport/terminal     LD_PRE LD_PST
EGRMDSHP     Num 8 YES_NO Ferry/boat/ship- from airport/terminal     LD_PRE LD_PST
EGRMDSHT     Num 8 YES_NO Shuttle/limo- from airport/terminal     LD_PRE LD_PST
EGRMDSUB     Num 8 YES_NO Subway/commuter train- from airport/terminal     LD_PRE LD_PST
EGRMDTXI     Num 8 YES_NO Taxi- from airport/terminal     LD_PRE LD_PST
EGRMDWLK     Num 8 YES_NO Walking- from airport/terminal     LD_PRE LD_PST
EGRMOD21 I11*   Char 2 $MODEB Trans used: egress place to dest-1     LD_PRE LD_PST
EGRMOD22 I11*   Char 2 $MODEB Trans used: egress place to dest-2     LD_PRE LD_PST
EGRMOD23 I11*   Char 2 $MODEB Trans used: egress place to dest-3     LD_PRE LD_PST
EGRMODE1 I11   Char 2 $MODE Det trans used: egress place to dest-1     LD_PRE LD_PST
EGRMODE2 I11   Char 2 $MODE Det trans used: egress place to dest-2     LD_PRE LD_PST
EGRMODE3 I11   Char 2 $MODE Det trans used: egress place to dest-3     LD_PRE LD_PST
EGRMSA *   Char 4 $MSA Egress place (to far dest)-PMSA/MSA/CMSA     LD_PRE LD_PST
EGRREG *   Char 2 $CEN_REG Egress place (to far dest)-Census region     LD_PRE LD_PST
EGRST I10   Char 2 $STATE Egress place (to far dest)-State     LD_PRE LD_PST
ENDTRAV *   Char 6   Ending date of travel period     LD_PRE LD_PST
ENDTRIP H1*   Char 6   Ending date of trip (YYYYMM)     LD_PRE LD_PST
FARDIV *   Char 2 $CEN_DIV Farthest destination Census division     LD_PRE LD_PST
FARLODG1 I14   Char 2 $FARLODG Farthest destination-lodging1     LD_PRE LD_PST
FARLODG2 I14   Char 2 $FARLODG Farthest destination-lodging1     LD_PRE LD_PST
FARLODG3 I14   Char 2 $FARLODG Farthest destination-lodging1     LD_PRE LD_PST
FARMDOB     Num 8 YES_NO Charter/school/other bus- at destination     LD_PRE LD_PST
FARMDOT     Num 8 YES_NO Intercity/other train- at destination     LD_PRE LD_PST
FARMDOTH     Num 8 YES_NO Other means- at destination     LD_PRE LD_PST
FARMDPOV     Num 8 YES_NO Personal vehicle- at destination     LD_PRE LD_PST
FARMDPTB     Num 8 YES_NO Public transit bus- at destination     LD_PRE LD_PST
FARMDSHP     Num 8 YES_NO Ferry/boat/ship- at destination     LD_PRE LD_PST
FARMDSHT     Num 8 YES_NO Shuttle/limo- at destination     LD_PRE LD_PST
FARMDSUB     Num 8 YES_NO Subway/commuter train- at destination     LD_PRE LD_PST
FARMDTXI     Num 8 YES_NO Taxi- at destination     LD_PRE LD_PST
FARMDWLK     Num 8 YES_NO Walking- to at destination     LD_PRE LD_PST
FARMOD21 I12*   Char 2 $MODEB Trans used: farthest destination-1     LD_PRE LD_PST
FARMOD22 I12*   Char 2 $MODEB Trans used: farthest destination-2     LD_PRE LD_PST
FARMOD23 I12*   Char 2 $MODEB Trans used: farthest destination-3     LD_PRE LD_PST
FARMOD24 I12*   Char 2 $MODEB Trans used: farthest destination-4     LD_PRE LD_PST
FARMOD25 I12*   Char 2 $MODEB Trans used: farthest destination-5     LD_PRE LD_PST
FARMODE1 I12   Char 2 $MODE Det trans used: farthest dest-1     LD_PRE LD_PST
FARMODE2 I12   Char 2 $MODE Det trans used: farthest dest-2     LD_PRE LD_PST
FARMODE3 I12   Char 2 $MODE Det trans used: farthest dest-3     LD_PRE LD_PST
FARMODE4 I12   Char 2 $MODE Det trans used: farthest dest-4     LD_PRE LD_PST
FARMODE5 I12   Char 2 $MODE Det trans used: farthest dest-5     LD_PRE LD_PST
FARMSA *   Char 4 $MSA Farthest destination PMSA/MSA/CMSA     LD_PRE LD_PST
FARREA21 I13*   Char 2 $REASONB Main reason for TP trip-1     LD_PRE LD_PST
FARREA22 I13*   Char 2 $REASONB Other reason for TP trip-1     LD_PRE LD_PST
FARREA23 I13*   Char 2 $REASONB Other reason for TP trip-2     LD_PRE LD_PST
FARREA24 I13*   Char 2 $REASONB Other reason for TP trip-3     LD_PRE LD_PST
FARREAS1 I13   Char 2 $REASON Det main reason for trip-1     LD_PRE LD_PST
FARREAS2 I13   Char 2 $REASON Det main reason for trip-2     LD_PRE LD_PST
FARREAS3 I13   Char 2 $REASON Det main reason for trip-3     LD_PRE LD_PST
FARREAS4 I13   Char 2 $REASON Det main reason for trip-4     LD_PRE LD_PST
FARREG *   Char 2 $CEN_REG Farthest destination: Census region     LD_PRE LD_PST
FARST H1   Char 2 $STATE Farthest destination: State     LD_PRE LD_PST
FARSTOP I16   Char 2 $YES_NO Any overnight stops to destination     LD_PRE LD_PST
FLGPRDRV * NQR Char 2 $FLGPRDR Primary driver status of respondent PER_PRE PER_PST    
FRSTHM G8 NQR Char 2 $YES_NO At home at start of travel day PER_PRE PER_PST    
GCDACCOD *   Num 8 MISSING Great Circle Distance: origin to access     LD_PRE LD_PST
GCDDO *   Num 8 MISSING Great Circle Distance: dest to origin     LD_PRE LD_PST
GCDEGROD *   Num 8 MISSING Great Circle Distance: egress to dest     LD_PRE LD_PST
GCDOD *   Num 8 MISSING Great Circle Distance: origin to dest     LD_PRE LD_PST
GCDTOT *   Num 8 MISSING Total trip great circle distance miles     LD_PRE LD_PST
GCDWORK * NQR Num 8 GCDWORK Great Circle distance to work (miles) PER_PRE PER_PST    
GT1JBLWK E6 Y Char 2 $YES_NO Have more than one job PER_PRE PER_PST    
HBHRESDN     Char 9 $RESD Housing units per sq mile - Block group PER_PRE PER_PST LD_PRE LD_PST
HBHTNRNT     Char 9 $MISSING Percent renter-occupied - Block group PER_PRE PER_PST LD_PRE LD_PST
HBHUR     Char 2 $HUR Urban / Rural indicator - Block group PER_PRE PER_PST LD_PRE LD_PST
HBPPOPDN     Char 9 $POPD Population per sq mile - Block group PER_PRE PER_PST LD_PRE LD_PST
HH_HISP C6   Char 2 $YES_NO Hispanic status of HH respondent     LD_PRE LD_PST
HH_ONTP I2*   Num 8   Num of HH members on travel period trip     LD_PRE LD_PST
HHC_MSA *   Char 4 $MSA MSA or CMSA Code for HH PER_PRE PER_PST LD_PRE LD_PST
HHFAMINC M14* SD Char 2 $INCOME Total HH family income (last 12 months) PER_PRE PER_PST LD_PRE LD_PST
HHINCTTL M14* NQR Char 2 $INCOME Total income all HH members PER_PRE PER_PST LD_PRE LD_PST
HHMDRV I7   Char 2 $HHMDRV Person number of driver     LD_PRE LD_PST
HHR_DRVR * NQ Char 2 $HHR_DRV Driver status of HH respondent PER_PRE PER_PST    
HHR_EDUC M7* NQ Char 2 $EDUC Education level of HH respondent PER_PRE PER_PST LD_PRE LD_PST
HHR_HISP C6* NQ Char 2 $YES_NO Hispanic status of HH respondent PER_PRE PER_PST LD_PRE LD_PST
HHR_RACE C7* NQ Char 2 $HHR_RAC Race of HH respondent PER_PRE PER_PST LD_PRE LD_PST
HHR_WRKR * NQ Char 2 $YES_NO Worker status of HH respondent PER_PRE PER_PST LD_PRE LD_PST
HHRESP * Y Char 2   Person number of HH interview respondent PER_PRE PER_PST LD_PRE LD_PST
HHSIZE C3* Y Num 8   Count of HH members PER_PRE PER_PST LD_PRE LD_PST
HHSTATE D4* SD Char 2 $STATE State of HH location PER_PRE PER_PST LD_PRE LD_PST
HHSTFIPS * SD Char 2 $FIPSTAT FIPS State Code for HH PER_PRE PER_PST LD_PRE LD_PST
HHVEHCNT B1* Y Num 8   Count of vehicles in HH PER_PRE PER_PST LD_PRE LD_PST
HOMEOWN C2 Y Char 2 $HOMEOWN Housing unit owned or rented PER_PRE PER_PST LD_PRE LD_PST
HOMETYPE C1 NR Char 2 $HOMETYP Type of housing unit PER_PRE PER_PST LD_PRE LD_PST
HOUSEID * Y Char 8   Household ID PER_PRE PER_PST LD_PRE LD_PST
HTEEMPDN     Num 8 MISSING Jobs per sq mile - Tract level PER_PRE PER_PST LD_PRE LD_PST
HTHRESDN     Char 9 $RESD Housing units per sq mile - Tract level PER_PRE PER_PST LD_PRE LD_PST
HTHTNRNT     Num 8 MISSING Percent renter-occupied - Tract level PER_PRE PER_PST LD_PRE LD_PST
HTHUR     Char 2 $HUR Urban / Rural indicator - Tract level PER_PRE PER_PST LD_PRE LD_PST
HTPPOPDN     Char 9 $POPD Population per sq mile - Tract level PER_PRE PER_PST LD_PRE LD_PST
IFARCTRY H1*   Char 20 $MISSING Farthest intl country reached - LD trip     LD_PRE LD_PST
IMPTAGE * X Char 1 $YES_NO Respondent age imputed PER_PRE PER_PST LD_PRE LD_PST
IMPTHOWN * X Char 1 $YES_NO Home ownership imputed PER_PRE PER_PST LD_PRE LD_PST
IMPTHTYP * X Char 1 $YES_NO Home type imputed PER_PRE PER_PST LD_PRE LD_PST
IMPTLEDT *   Char 1 $YES_NO LVEDATE imputed. 1:Yes, 0:No     LD_PRE LD_PST
IMPTNTIM *   Char 1 $YES_NO NTIMES imputed. 1:Yes, 0:No     LD_PRE LD_PST
IMPTRACE * X Char 1 $YES_NO Race of HH respondent imputed PER_PRE PER_PST LD_PRE LD_PST
IMPTREDT *   Char 1 $YES_NO Recurring date imputed     LD_PRE LD_PST
IMPTSEX * X Char 1 $YES_NO Respondent gender imputed PER_PRE PER_PST LD_PRE LD_PST
INDVINC M24* SD Char 2 $INCOME Income of resp. if reported separately PER_PRE PER_PST    
INT_FLAG *   Char 2 $YES_NO International destination flag     LD_PRE LD_PST
LANG * NQR Char 1 $LANG Language HH interview conducted in PER_PRE PER_PST LD_PRE LD_PST
LASTRPMM G14 NQR Char 2 $LASTRPM Month of last trip before travel day PER_PRE PER_PST    
LASTRPYY G14 NQR Char 4 $MISSING Year of last trip before travel day PER_PRE PER_PST    
LIF_CYC * SD Char 2 $LIF_CYC HH Life cycle classification PER_PRE PER_PST LD_PRE LD_PST
LSTTRDAY G15* NQR Num 8 MISSING Days since last trip before travel day PER_PRE PER_PST    
LSTTRDT G14* NQR Char 6 $MISSING Date of last trip before travel day PER_PRE PER_PST    
LVEMNT H1   Char 2 $MONTH Month the travel period trip began     LD_PRE LD_PST
LVEYR H1   Char 4   Year the travel period trip began     LD_PRE LD_PST
MAINMOD2 I5*   Char 2 $MODEB Trans used most to get to destination     LD_PRE LD_PST
MAINMODE I5*   Char 2 $MODE Detail-Trans used most to get to dest     LD_PRE LD_PST
MEDCOND M4 NQR Char 2 $YES_NO Have a med cond making travel difficult PER_PRE PER_PST    
MEDCOND6 M5 NQR Char 2 $MEDCOND Length of time with medical condition PER_PRE PER_PST    
MSACAT * NQR Char 2 $MSACAT MSA Category of HH PER_PRE PER_PST LD_PRE LD_PST
MSASIZE * Y Char 2 $MSASIZE MSA size of HH PER_PRE PER_PST LD_PRE LD_PST
NBIKETRP L4 NQR Num 3 MISSING No. of bike trips in past week PER_PRE PER_PST    
NTIMES H1   Num 3 MISSING Number of times TP trip was taken     LD_PRE LD_PST
NTSAWAY H1*   Num 8   Nights away on travel period trip     LD_PRE LD_PST
NUMADLT C8* SD Num 8 MISSING Number of adults (18+) in HH PER_PRE PER_PST LD_PRE LD_PST
NUMNHHM I4   Num 4 MISSING Number of non-HH members on TP trip     LD_PRE LD_PST
NWALKTRP L3 NQR Num 3 MISSING No. of walk trips in past week PER_PRE PER_PST    
OCCAT E7* NQR Char 2 $OCCAT Occupational category of resp PER_PRE PER_PST LD_PRE