The information supply sub-system gives the motorists information on congestion, travel times, traffic regulations, and parking space. Finally, the operation management subsystem operates traffic control system within a prefecture, provides supervisors at the traffic control centre with the information on the traffic situation and on the condition of other subsystems, and exchanges information with the information collecting subsystems in other prefectures. Within its ITS policy, other initiatives were developed in line with the UTMS to promote further use of technology and aggregate services for motorists that they can access from a single on-board unit (OBU).