2000 Volume 17 Pages 155-162
This paper aims to describe characteristics of the trips omitted by respondents in person trip survey. We carried out original survey in order to compare person trip survey with activity survey. The results are followings; 1) about 20% of trips in a person trip survey are omitted; 2) omitted trips are related to going home trip; 3) omitted trips are not aware clearly as travel event by respondents.