The present invention relates to a method of warning of accidental accidents when reversing a vehicle to warn of danger by detecting projections on a near rear surface lower than the vehicle body at the time of reversing.;Conventional cars can easily identify objects that are higher than the car body because the driver visually checks the rear of the car.However, projections and children may not be able to identify the car near the car. If there was a problem that caused a risk.;The present invention includes a photo sensor for detecting an object in a bumper at the rear of the vehicle, and detects an object in the near blind spot at the rear side lower than the vehicle body by the photosensor when reversing and warns when an accident is detected. The collision will be prevented beforehand.
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