Abstract: This driving assistance system is provided with: a position specification unit that specifies the positions of vehicles passing along a road; a selection unit that selects a first vehicle from the vehicles; an area-setting that sets, around the first vehicle, an attention call area of a prescribed shape that moves following the movement of the first vehicle; a notification unit that notifies a second vehicle that has entered the attention call area of the presence of the first vehicle; and, an area change unit that expands the attention call area according to the state of the first vehicle.

Abstract: A detection means detects an object. A warning area setting means sets a warning area around the detected object. A notification means notifies a moving entity in the warning area of the presence of the detected object. The warning area setting means sets the warning area of a size according to at least one of detection quality information on detection accuracy of the detected object and notification communication quality information on communication quality of communication used for notifying the moving entity.

Abstract: A fault diagnosis device includes circuitry configured to acquire diagnosis target data including parameter values from the diagnosis target system, to store extraction source data including a plurality of data sets that includes the parameter values of the diagnosis target data representing a normal state of the diagnosis target system, to determine an extraction condition based on the diagnosis target data and on condition setting information, to extract a group of data sets satisfying the extraction condition among the plurality of data sets, to select, as learning data, a number of first data sets of the group, in which the data sets of the group are sorted according to a sorting criterion, to generate learning information from the learning data, and to determine whether the diagnosis target data associated with the diagnosis target system is faulty based on the learning information.