In recent years, traffic accidents caused by elderly drivers have been increasing in Japan. These troubles have an impact on not only the parties of the accidents and their families, but also for the local community. To improve this situation, the government has been promoting the voluntary return of elderly people's driving licenses. Local governments have been supporting the promotion of this and supporting the provision of public transportation as an alternative to automobiles at the same time. Based on this background, this paper examines the effective methods of public relations to support projects for the voluntary return of driving licenses by using a survey conducted on residents of Saga Prefecture irrespective of age.
    The action on the revitalization of local public transportation has required local governments to make efforts to formulate local public transportation plans. Based on this action, it is expected for each local government ensure transportation within their regions. With the results of senior people's voluntary return of driving licenses, local governments have been implementing support projects for them to keep mobility, including discounts on public transportation fares.
    In this study, we conducted a questionnaire survey on residents' willingness toward public transport services in Saga Prefecture. This was done to consider effective methods of public relations to support projects of voluntary return of driving licenses. According to our survey results, there were problems with support systems for elderly people's voluntary return of driving licenses and with the method of public relations for supporting the project. The contents (incentives) of the driver's license return support system in Saga Prefecture leaves room for improvement that reflects the residents' needs to go hospitals and retail shops. Also, efforts to promote health and extend healthy life expectancy are insufficient in these projects. This study points out the following two implications.
     First, in local cities, which are automobile societies, it is necessary to improve convenience by an linking inconvenient public transportation with sharing services. In these days, SAGA Mobility LABO, an industry-academia-government collaboration organization has embarked on the MaaS (Mobility as a Service) business, which combines various public transportation and sharing services. There are two expectations for this MaaS business such as “improvement of service level of public transportation” and “support to elderly people who return licenses”.
    Second, it is reasonable as a way of disseminating information that local governments use media such as television and newspapers to increase public awareness of support projects accompanying the voluntary return of driver's licenses. It is certainly reasonable, but, nevertheless, not effective enough. Therefore, it is necessary to improve public relations activities.

    Suburban municipalities on the outskirts of metropolitan areas with rapidly declining and aging populations are expected to face severe difficulties in their financial management due to a decrease in municipal residential taxes and increased costs related to social security.
    This paper focuses on Yokohama City as a case study for assessing the future of individual municipal residential taxes, which are important for the fiscal management of suburban municipalities within metropolitan areas. A spatial analysis is also conducted at the sub-regional scale on population composition, combined with a quantitative analysis of the relationships among occupational composition, commuting destinations, and population movements at the ward scale:
    The main findings are as follows.
    (1) In Yokohama City, population and tax revenues will begin to decline in many wards between 2025 and 2030, with a full-scale decline phase setting in between 2030 and 2035. During this period, the rate of change in tax revenues is expected to be lower than the rate of change in population, making fiscal management more difficult.
    (2) The rate of change in tax revenue is significantly affected by the proportion of the population who are male baby boomers (early 1970s cohort) and men with high income levels of the cohorts of the early and the late 1960s.
    (3) Wards that feature a high proportion of males in these three cohorts feature a high rate of decline. In parallel with settlement measures for young people, it will be necessary to clarify the reasons why men of these cohorts and their households will move out and to implement measures to alleviate this that are in line with local characteristics.