Abstract: The Declaration of this Invention has been confirmed on Apr. 24, 2009, and filed on Feb. 20, 2011. Reverse gear automatic warning for motor vehicles is an automatic system with alarm sound and alarm lights that work simultaneously and activates the alarm when vehicle moves backwards and deactivates the alarm when vehicle stops. The advantages of presenting such a system and its usage will be: 1. To have an ongoing traffic 2. To let the police make the right recognition and decision in case of any accident 3. Safety for the pedestrians and the drivers in any accident 4. To have the enough vision from the sides of the car, if the light will be installed in the side of the car just like those of the rear 5. To have the sound of the horn for the pedestrians when crossing the street from the back of the car The above system is acting automatically. In case the driver forgets to turn on the flasher or horn, the system will be turned on automatically and start working.