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12 Standardized Procedures for Personal Travel Surveys of the household and its members, the attributes of the vehicles owned, and the attributes of the travel and activities that are recorded by household members. Based on the discussion in Section 4.1 of the Technical Appendix, the recommended mini- mum question specifications are shown in Table 2. These represent the minimum set of ques- tions recommended in all future household travel surveys. Additional questions may be asked in many surveys, however. For example, income is not included for reasons that are discussed in Section 4.1 of the Technical Appendix. Many recent surveys would not conform to this specifi- cation, which is also indicative of the problems of comparability and completeness in current surveys. 2.1.2 I-2: Categories for Minimum and Other Questions For the minimum questions suggested in the preceding question, a number are subject to con- siderable variability in the categories that might be used to record the data. Proposing a set of standardized categories for those questions and also for one or two other questions that are likely to be included in many surveys would seem useful in pursuing the goal of improving compara- bility, accuracy, and quality. The variables selected for standardization of categories are type of dwelling (H2), relationship (H4), housing tenure (H7), education level attained (P10), disability (P11), race (P12), vehicle body type (V1), vehicle ownership (V5), trip purpose (A2), means of Table 2. Recommended minimum question specifications. Category Ref. Item Description Household H1 Location Home address or home position in geographic terms H2 Type of Building Detached, semi-detached, terraced, flat, etc. H3 Household Size Number of household members H4 Relationships Matrix of relationships between all members of the household H6 Number of Vehicles Summary of number of vehicles from vehicle data H7 Housing Tenure Own or rent status H8 Re-contact Willingness to be contacted again for further surveys, etc. Personal P1 Gender P2 Year of Birth (Preferable to requesting age) P4 Paid Jobs Number of paid positions and hours worked at each in the past week P6 Job Classification Employee, self-employed, student, unemployed, retired, not employed, etc. P7 Driving License Whether a current drivers license is held P8 Non-mobility Indication of why no out-of-home activity was performed on a survey day including work-at-home days P10 Education Level Highest level of education achieved P11 Disability Types of mobility disability, both temporary and permanent P12 Racea Defined as currently measured in the U.S. Census P13 Hispanic Origin Defined as currently measured in the U.S. Census Vehicle V3 Body Type e.g., car, van, RV, SUV, etc. V4 Year of Production V5 Ownership of Vehicle Household/person, lease, institution V6 Use of Vehicle Main user of vehicle Activity A1 Start Timeb A2 Activity or Purpose A3 Location Where the activity was performed, unless traveling A4 Means of Travel If activity is travel, what mode(s) was used (including specifying if a car passenger or driver) A5 Mode Sequence Unless collected as fully segmented data A6 Group Size Number of persons traveling with respondent as a group A7 Group Membership Number of persons in the group who live in respondent's household A8 Costs Total amount spent on tolls, fares, and respondent's share A9 Parking Amount spent to park a All surveys would use the U.S. Census Bureau definition of Race and Hispanic Origin. b Only start time needs to be ascertained in a time-use or activity survey because, by definition, the start time of an activity is the end time of the previous activity. Only the last activity should need an end time. In a trip-based survey, start and end time should be included.