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特許 権利維持 A movement warning system for notifying a proximal entity of the approach of a vehicle comprising a sensor system, a controlling mobile device, and a signal generator system. The sensor system generates motion data indicative of movement of the vehicle. The controlling mobile device generates at least one warning signal based on the motion data. The signal generator system generates at least one warning based on the at least one warning signal. The signal generator generates the warning such that the proximal entity perceives the warning.