An embodiment of the invention provides for multiple service classes within a controllable transit system (e.g., a PRT system), by route allocation according to service class priority. Routes are optimized for vehicles needing or entitled to the highest service level, then remaining capacity is used to optimize routes for the next lower service class. Such optimization can be extended indefinitely, through “N” service classes of service. In addition, an embodiment of the invention allows the cataloging of PRT capacity and vehicle types/roles/emissions, as well as related business models. The system provided hereunder provides a means of ensuring that various service classes of system users can be given treatment according to the service class in which they reside. Such prioritization leads to a more flexible system, with higher user satisfaction and a greater number of available business models (e.g., “pay for service class”) permissible within the transit system.