Abstract
This study focuses on users' waiting behavior at lavatories in the service area of expressway. The locations where waiting occurs were observed at 4 spatial types of lavatories, using record from log sensors and cameras. The results revealed that choice of waiting position was influenced by easiness to check vacant booth, prevent others from passing by, and approach to booths without disturbed by others. These are understood by users' basic demand that want to secure many booth options in order to use one of them as soon as possible. Based on these findings, some suggestions for planning are proposed.
