A hazard warning apparatus for use in motor vehicles enabling a driver observing a road hazard to warn other drivers. One embodiment is provided with at least one light preferably an array of lights arranged as a hazard warning signal mounted a body associated of the vehicle in a forward facing direction in order to warn oncoming traffic when illuminated. A power supply circuit provides an intermittently pulsed power signal to the array of lights for a limited period of time in response to an input signal and then automatically turns off. An input switch located proximate the driver when engaged communicates with the power supply causing the array of lights to be intermittently pulsed. In another embodiment the hazard warning apparatus communicates with other vehicles providing a hazard warning via a wireless signal.