US Patent 8010248 Data recorder

A data recorder has: a controlled state detecting unit, operable to detect a controlled state of a vehicle by a driver; an operating state detecting unit, operable to detect an operating state of the vehicle; a state recording unit; and a recording condition determination unit, operable to determine whether or not the controlled state and the operating state are recorded in the state recording unit based on at least the controlled state of the controlled and operating states.