NHTS
FHWA

Codebook Browser

Survey:
Dataset:
Codebook Variable Description Household File Person File Vehicle File Daytrip File Question Type Size
Codebook ANNMILES Self-reported annualized mile estimate Y DV* N 8
Codebook AWAYHOME Travel day reason S was away from home Y G25a C 2
Codebook BESTMILE Best estimate of annual miles Y ORNL N 8
Codebook BEST_EDT Flag any edits/adjustments to BESTMILE Y ORNL C 2
Codebook BEST_FLG How BESTMILE was computed Y ORNL C 2
Codebook BEST_OUT Flag identifying BESTMILE outlier values Y ORNL C 2
Codebook BORNINUS Respondent was born in U.S. Y M8 C 2
Codebook CARRODE Number of people in vehicle last week Y E18 N 8
Codebook CDIVMSAR Grouping of HH by combination of Census Division, MSA status, and presence of a subway system (if area > 1 million) Y Y Y Y DV_1* C 2
Codebook CENSUS_D Census division classification for home address Y Y Y Y DV_2* C 2
Codebook CENSUS_R Census region classification for home address Y Y Y Y DV_3* C 2
Codebook CNTTDHH Category of number of household trips Y DV* C 2
Codebook CNTTDTR Count of travel day trips for this respondent Y DV_4* N 8
Codebook CONDNIGH Medical condition results in limiting driving to daytime Y M6 C 2
Codebook CONDPUB Medical condition results in using bus/subway less frequently Y M6 C 2
Codebook CONDRIDE Medical condition results in asking others for rides Y M6 C 2
Codebook CONDRIVE Medical condition results in giving up driving Y M6 C 2
Codebook CONDSPEC Medical condition results in using special transit services Y M6 C 2
Codebook CONDTAX Medical condition results in using a reduced fare taxi Y M6 C 2
Codebook CONDTRAV Medical condition results in reduced day-to-day travel Y M6 C 2
Codebook DELIVER Number of these internet purchases delivered to home Y Mb N 4
Codebook DIARY Indicates if travel diary was completed Y DV_5* C 2
Codebook DISTTOSC Distance home to school Y F3 C 2
Codebook DISTTOWK One-way distance to workplace (miles) Y E14 N 8
Codebook DRIVER Driver status of S Y Y DV_8* C 2
Codebook DROP_PRK Parked or dropped off at public transit Y G35a C 2
Codebook DRVRCNT Number of drivers in HH Y Y Y Y DV_10* N 8
Codebook DRVR_FLG Subject was driver on this trip Y DV_9* G49 C 2
Codebook DTACDT Respondent's view on Safety concerns Y L2a C 2
Codebook DTCONJ Respondent's view on Highway congestion Y L2a C 2
Codebook DTCOST Respondent's view on Price of travel (fees, tolls and gas) Y L2a C 2
Codebook DTRAGE Respondent's view on Aggressive/distracted drivers Y L2a C 2
Codebook DTRAN Respondent's view on Access or availability of public transit Y L2a C 2
Codebook DTWALK Respondent's view on Lack of walkways or sidewalks Y L2a C 2
Codebook DWELTIME Calculated Time (minutes) at Destination Y DV* N 8
Codebook EDUC Highest grade completed Y Y M7 C 2
Codebook EIADMPG EIA derived miles per gasoline-equivalent gallon estimate Y EIA N 8
Codebook ENDTIME Trip END time in military Y DV_11* C 4
Codebook EPATMPG Unadjusted 55/45 combined fuel economy Y EIA N 8
Codebook EPATMPGF Imputation flag for EPATMPG Y EIA C 2
Codebook EVERDROV Has been a driver in the past Y C8 C 2
Codebook FLAG100 Did HH have 100% of members complete interview? Y Y Y Y DV* C 2
Codebook FLEXTIME Respondent can set or change start time of work day Y Ec C 2
Codebook FMSCSIZE Number of people on from school trip Y F8 N 8
Codebook FRSTHM Did Person Start Travel Day at Home? Y Y G8 C 2
Codebook FUELTYPE Type of fuel Y EIA N 8
Codebook FXDWKPL No fixed workplace Y DV* C 2
Codebook GASPRICE Price of gasoline (cents) on respondent's travel day Y * N 8
Codebook GCDWORK Great circle distance (miles) between home and work Y DV_12* N 8
Codebook GRADE Grade allowed to walk/bike to/from school without adult Y F10 C 2
Codebook GSCOST Fuel cost in nominal US dollars per gasoline-equivalent gallon Y EIA N 8
Codebook GSTOTCST Annual fuel expenditures in nominal US dollars Y EIA N 8
Codebook GSYRGAL Annual fuel consumption in gasoline-equivalent gallons Y EIA N 8
Codebook GT1JBLWK Have more than one job Y E6 C 2
Codebook HBHTNRNT Percent renter-occupied - Block group Y Y Y Y Claritas C 2
Codebook HBHUR Urban / Rural indicator - Block group Y Y Y Y Claritas C 2
Codebook HBPPOPDN Population per sq mile - Block group Y Y Y Y Claritas C 5
Codebook HBRESDN Housing units per sq mile - Block group Y Y Y Y Claritas C 5
Codebook HHC_MSA CMSA FIPS code for HH address Y Y Y Y DV_13* C 4
Codebook HHFAMINC Derived total HH income Y Y Y Y DV_16* C 2
Codebook HHMEMDRV HH member drove on trip Y G48 C 2
Codebook HHRELATD At least some HHMs are related Y C4 C 2
Codebook HHRESP Person ID number of household respondent Y Y Y Table 1* C 2
Codebook HHSIZE Count of HH members Y Y Y Y DV_18* N 8
Codebook HHSTATE State HH location Y Y Y Y DV_19* C 2
Codebook HHSTFIPS State FIPS for HH address Y Y Y Y DV_20* C 2
Codebook HHVEHCNT Count of HH vehicles Y Y Y Y DV_21* N 8
Codebook HH_CBSA CBSA FIPS code for HH address Y Y Y Y DV_64* C 5
Codebook HH_HISP Hispanic status of HH respondent Y Y Y Y C6 C 2
Codebook HH_ONTD Derived number of HHMs on trip Y DV_22* N 8
Codebook HH_RACE Race of HH respondent Y Y Y Y C7 C 2
Codebook HOMEOWN Housing unit owned or rented Y Y Y Y C2 C 2
Codebook HOMETYPE Type of housing unit Y Y Y Y C1 C 2
Codebook HOUSEID HH eight-digit ID number Y Y Y Y Table 1* C 8
Codebook HTEEMPDN Workers per square mile living in Tract Y Y Y Y Claritas C 4
Codebook HTHTNRNT Percent renter-occupied - Tract level Y Y Y Y Claritas C 2
Codebook HTPPOPDN Population per sq mile - Tract level Y Y Y Y Claritas C 5
Codebook HTRESDN Housing units per sq mile - Tract level Y Y Y Y Claritas C 5
Codebook HYBRID Vehicle is Hybrid or uses alternate fuel Y C22c C 2
Codebook INTSTATE A part of this trip was on interstate Y Gb C 2
Codebook ISSUE Most important transportation issue Y L2a C 2
Codebook LIF_CYC Life Cycle classification for the HH Y Y Y Y DV_24* C 2
Codebook LSTTRDAY Approximate number of days since last trip Y DV_25* N 8
Codebook MAKECODE NASS vehicle make code Y DV_26* B2 C 2
Codebook MCUSED Times used motorcycle/moped on road in the past month Y La N 4
Codebook MEDCOND Have medical condition making it hard to travel Y M4 C 2
Codebook MEDCOND6 Length of time with medical condition Y M5 C 2
Codebook MODLCODE NASS vehicle model code Y DV_27* B2 C 3
Codebook MOROFTEN Would like to get out more often Y Ga C 2
Codebook MSACAT MSA category for the HH home address Y Y Y Y DV_28* C 2
Codebook MSASIZE MSA population size for the HH home address Y Y Y Y DV_29* C 2
Codebook NBIKETRP Number of bike trips in past week Y Table 1* L4 N 8
Codebook NONHHCNT Derived number of non-HHMs on trip Y DV_30* N 8
Codebook NUMADLT Count of adult HHMs at least 18 years old Y Y Y Y DV_31* N 8
Codebook NUMONTRP Count of total people on trip Y DV_32* N 8
Codebook NWALKTRP Number of walk trips in past week Y L3 N 3
Codebook OCCAT Job category Y E7 C 2
Codebook OD_READ Odometer reading Y N2 N 5
Codebook ONTD_P1 Person number 1 was on travel day trip Y DV* C 2
Codebook ONTD_P10 Person number 10 was on travel day trip Y DV* C 2
Codebook ONTD_P11 Person number 11 was on travel day trip Y DV* C 2
Codebook ONTD_P12 Person number 12 was on travel day trip Y DV* C 2
Codebook ONTD_P13 Person number 13 was on travel day trip Y DV* C 2
Codebook ONTD_P14 Person number 14 was on travel day trip Y DV* C 2
Codebook ONTD_P15 Person number 15 was on travel day trip Y DV* C 2
Codebook ONTD_P2 Person number 2 was on travel day trip Y DV* C 2
Codebook ONTD_P3 Person number 3 was on travel day trip Y DV* C 2
Codebook ONTD_P4 Person number 4 was on travel day trip Y DV* C 2
Codebook ONTD_P5 Person number 5 was on travel day trip Y DV* C 2
Codebook ONTD_P6 Person number 6 was on travel day trip Y DV* C 2
Codebook ONTD_P7 Person number 7 was on travel day trip Y DV* C 2
Codebook ONTD_P8 Person number 8 was on travel day trip Y DV* C 2
Codebook ONTD_P9 Person number 9 was on travel day trip Y DV* C 2
Codebook OUTCNTRY S out of country entire travel day Y G14 C 2
Codebook OUTOFTWN R Was out of town the entire travel day Y Y G9 C 2
Codebook PAYPROF Worked for pay or profit last week Y E4 C 2
Codebook PAYTOLL Toll paid on this interstate Y Gc C 2
Codebook PERSONID Person ID number Y Y Y Table 1* C 2
Codebook PRMACT Primary activity last week Y Y E3 C 2
Codebook PROXY Trip info from respondent or proxy Y Y Table 1* E1 C 2
Codebook PSGR_FLG S was passenger on trip that only used POV Y DV_36* C 2
Codebook PTUSED How often S used public transit in past month Y L11 N 4
Codebook PUBTRANS Respondent Used Public Transportation on trip Y DV* C 2
Codebook PURCHASE Number of times purchased via internet in past month Y Ma N 4
Codebook RAIL MSA heavy rail status for HH Y Y Y Y DV_38* C 2
Codebook RESP_CNT Count of responding persons per HH Y DV_39* N 8
Codebook R_AGE Respondent Age Y Y Table 1* C5 N 4
Codebook R_RELAT Respondent relationship to HH respondent Y Table 1* C 2
Codebook R_SEX Respondent gender Y Y DV_37* C 2
Codebook SAMEPLC Stayed at same place all day Y G13 C 2
Codebook SCHCARE Attends before or after school care Y F4 C 2
Codebook SCHCRIM Walk/Bike issue: violence/crime along route Y F11 C 2
Codebook SCHDIST Walk/Bike issue: distance between home & school Y F11 C 2
Codebook SCHSPD Walk/Bike issue: speed of traffic along route Y F11 C 2
Codebook SCHTRAF Walk/Bike issue: amount of traffic along route Y F11 C 2
Codebook SCHTRN1 Mode to school Y F5 C 2
Codebook SCHTRN2 Mode from school Y F7 C 2
Codebook SCHTYP School type Y F1 C 2
Codebook SCHWTHR Walk/Bike issue: poor weather or climate in area Y F11 C 2
Codebook SCRESP Person ID number of screener respondent Y C8 C 2
Codebook SELF_EMP Self-employed Y Ea C 2
Codebook SFWGT Weight for child 5-15, Safe Routes to School section Y Table4* N 8
Codebook STRTTIME Trip START time in military Y DV* C 4
Codebook TDAYDATE Date of Travel Day (YYYYMM) Y Y Y Y DV* C 8
Codebook TDCASEID Trip number Y Table 1* C 12
Codebook TDTRPNUM Travel Day Trip number Y DV* C 12
Codebook TDWKND TD trip was on weekend Y DV* C 2
Codebook TIMETOSC Minutes to get to school Y F9 N 3
Codebook TIMETOWK Minutes to go from home to work last week Y E15 N 4
Codebook TOSCSIZE Number of people on to school trip Y F6 N 3
Codebook TRACC1 1st mode used to get to public transit Y Table 1* G35 C 2
Codebook TRACC2 2nd mode used to get to public transit Y Table 1* G35 C 2
Codebook TRACC3 3rd mode used to get to public transit Y Table 1* G35 C 2
Codebook TRACC4 4th mode used to get to public transit Y Table 1* G35 C 2
Codebook TRACC5 5th mode used to get to public transit Y Table 1* G35 C 2
Codebook TRACCTM Derived time to get to public transit - minutes Y DV_41* N 8
Codebook TRAVDAY Travel day - day of week Y Y Y Y DV* C 2
Codebook TREGR1 1st mode used from public transit to destination Y Table 1* G38 C 2
Codebook TREGR2 2nd mode used from public transit to destination Y Table 1* G38 C 2
Codebook TREGR3 3rd mode used from public transit to destination Y Table 1* G38 C 2
Codebook TREGR4 4th mode used from public transit to destination Y Table 1* G38 C 2
Codebook TREGR5 5th mode used from public transit to destination Y Table 1* G38 C 2
Codebook TREGRTM How long to destination from transit - converted to minutes Y DV_42* N 8
Codebook TRIPPURP General Trip Purpose (Home-Based Purpose types) Y DV* C 8
Codebook TRPACCMP Number of people with R on trip Y G43 N 3
Codebook TRPHHACC Number of HHM with R on trip Y DV_44* N 8
Codebook TRPHHVEH HH vehicle used for trip Y G30 C 2
Codebook TRPMILES Calculated Trip distance converted into miles Y DV_43* N 8
Codebook TRPTRANS Transportation mode used on trip (as reported by respondent) Y G34 C 2
Codebook TRVLCMIN Calculated travel time Y G34* N 8
Codebook TRVL_MIN Derived trip time - minutes Y DV_45* N 8
Codebook TRWAITTM Derived length of wait for public transit - minutes Y DV_46* N 8
Codebook URBAN Home address in urbanized area Y Y Y Y DV_47* C 2
Codebook URBANSIZE Size of urban area in which home address is located Y Y Y Y DV_48* C 2
Codebook URBRUR Household in urban/rural area Y Y Y Y DV_49* C 2
Codebook USEINTST Interstate used for any trips Y Y N_G19 C 2
Codebook USEPUBTR Use public transit on travel day Y Y G19 C 2
Codebook VARSTRAT Linearization Variance Stratum for Std Err Calculation Y Y DV* N 8
Codebook VEHAGE Age of vehicle in years Y DV* N 8
Codebook VEHCOMM Commercial license plate Y C22b C 2
Codebook VEHID HH vehicle number used for trip Y Y G31 C 2
Codebook VEHOWNMO How long vehicle owned - Months Y DV_50* N 8
Codebook VEHTYPE Vehicle type Y Y VMAT6Y B2 C 3
Codebook VEHYEAR Vehicle Model year Y VMAT5Y B2 N 4
Codebook VMT_MILE Calculated Trip distance (miles) for Driver Trips Y DV* N 8
Codebook WEBUSE Frequency of internet use in past month Y M2 C 2
Codebook WHODROVE Person ID of driver on trip Y G49 C 2
Codebook WHOMAIN Person number of primary driver Y C12 C 2
Codebook WHYFROM Trip purpose for previous trip Y DV_52* C 2
Codebook WHYTO Travel day purpose of trip Y G26 A-E C 2
Codebook WHYTRP1S Trip purpose summary Y DV_53* C 2
Codebook WHYTRP90 1990 Trip Purpose Y DV* C 2
Codebook WKFMHMXX Frequency of working from home in past month Y E20 N 4
Codebook WKFTPT Work full or part-time Y E5 C 2
Codebook WKRMHM Has option to work at home Y Ed C 2
Codebook WKSTFIPS State FIPS code for work address Y DV_54* C 2
Codebook WORKER Subject worker status Y Y DV_55* C 2
Codebook WRKCOUNT Number of workers in HH Y Y Y Y DV_57* N 8
Codebook WRKTIME Usual arrival time at work Y Eb C 8
Codebook WRKTRANS Transportation mode to work last week Y E16 C 2
Codebook WTHHFIN Final HH weight Y Y Table 4* N 8
Codebook WTPERFIN Final person weight Y Table 4* N 8
Codebook WTTRDFIN Final trip weight Y Table 4* N 8
Codebook YEARMILE Miles respondent drove last 12 months Y L5 N 8
Codebook YRMLCAP Indicates YEARMILE was capped Y DV_61* C 2
Codebook YRTOUS Year entered U.S. Y Table 1* M10 N 8
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