Registering: This task waits for devices that ask for being subscribed to the service. It creates and keeps the list of clients and its particular requirements. It erases from the list the devices that have reached its destination.
Location: This task is permanently asking for information of location to the infrastructure of the vehicle. With this information it verifies if the vehicle is in the neighbourhood of an interest point.
Warning messages: When the location task detects that the vehicle is in an interest point, this task must
inform to all interested subscribed ACAs. The message contains explicit text about the interesting point. There
will be a thread of this task for each subscribed ACA because all interested clients must be notified at the same
time. Fig. 2 shows the execution flow of the ORIS.