关键词：电子信息；系统；交通实践
摘 要：Providing public transit on a fare-free basis for all passengers has tantalized public policymakers for decades. Proponents claim that if other public services such as schools, libraries, and parks (as well as most roads) are considered important enough to provide at no charge to the user, then providing everyone in the community with at least a basic means of mobility should also be a public good. The purpose of this synthesis is to document the past and current experiences of public transit agencies that have planned, implemented, and operated fare-free systems.