a system for providing a centrally planned , completely general routing system that assigns traffic routes to maintain optimal traffic system stability . the system includes a plurality of fixed computers , linked by a wide area network , which can communicate seemlessly with all vehicles in a region via a wireless communication system . the system is interactive , in that the fixed computers receive data such as desired route , position and segment transit time data from individual in - vehicle computer units and determine and communicate the system optimal route to each such in - vehicle unit .