2001 national household travel survey user's guide - NHTS Home ...

• a brochure describing the survey,
• an envelope with a diary and a two-dollar cash incentive for each
household member,
• a reminder card showing the assigned travel day,
• a map demarcating places over 50 miles from the household, and
• an odometer mileage form listing the household's vehicles.
The seven Morpace add-ons received all the above materials with the
exception of the travel period map and the odometer reading listing.
The next contact with the household was on the day before the household's
travel day. An NHTS interviewer called to find out if the household had received the
diary package and had any questions about the survey. The person answering the
telephone was asked to remind household members to complete their travel diaries on
the following day. If the interviewer was unable to reach the household, the interviewer
left an answering machine message and provided a toll-free number that household
members could use if they had any questions.
2-B.4. PERSON INTERVIEW
Calls for person interviews began the day following the travel day and
continued until all household members had completed a person interview, or up to a
maximum of six days after the travel day, whichever date came first. A six-day limit was
used because recall would be too difficult beyond that time.
Proxy interviews were requested for all household members under age 16.
However, interviewers could directly interview household members age 14 and 15 years
if asked to do so by an adult household member. Proxy interviews for adults were
allowed if:
• the subject was not capable of being interviewed because of an
impairment or a language barrier;
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