This synthesis will be of interest to transit agency general managers, bus operations, planning, scheduling, safety, and procurement staff, as well as agency communications and engineering staff. It addresses various aspects of developing and deploying automated vehicle location ( AVL) systems over the last 20 years. Current practice, AVL architecture and technologies, and the institutional context of AVL defined in terms of funding, justification, staffing and procurement are discussed. This report of the Transportation Research Board describes the different approaches to AVL deployment used at selected transit agencies. It attempts to define the role of AVL for bus transit by examining objectives of implementation and both technological and operational frameworks.