1. 1) Kato, H.: Social roles of taxis positioned as public transport, Proc. of Infrastructure Planning, Japan Society of Civil Engineers, Vol. 49, 2014 (in Japanese).
2. 2) Hayakawa, S.: Current status and challenges of unconventional transportation services in rural areas—Focusing on demand-type shared taxis and volunteer transportation by private cars, J. Japan Soc. Transp. Econ., Vol. 48, pp. 71-80, 2005 (in Japanese).
3. 3) Kato, H.: A possibility of community bus replacement service provided by taxi, JSTE J. Traffic Eng., Vol. 5, No. 2, pp. 27-32, 2019 (in Japanese).
4. 4) Meguro, T.: Current status and measures regarding support of outdoor mobility for elderly and handicapped persons—Towards introduction of the group taxi, J. Archit. Plan., Vol. 80, No. 714, pp. 1843-1852, 2015 (in Japanese).
5. 5) Moriyama, M.: Life and public transportation for the depopulated and aging mountainous area, J. Hous., Japan Housing Association, Sep. 2010 (in Japanese).