  Aging society has been becoming a global problem not only in advanced
countries. Under such circumstances, it is said that participation of elderly
people in social activities is highly desirable from various perspectives
including decrease of social welfare costs. Thus, we propose a mobile service
that notifies barrier information nearby users outside to lowers the anxiety of
elderly people and promote their social activities. There are barrier free maps
in some areas, but those are static and updated annually at the earliest.
However, there exist temporary barriers like road repairing and parked
bicycles, and also every barrier is not for every elder person. That is, the
elder people are under several conditions and wills to go out, so that a
barrier for an elder person is not necessarily the one for the other.
Therefore, we first collect the barrier information in the user participatory
manner and select the ones the user need to know, then timely provide them via
a mobile phone equipped with GPS. This paper shows the public experiment that
we conducted in Tokyo, and confirms the usability and the accuracy of the
information filtering.
