Abstract: The present invention is directed towards a danger alert system for a site, and in particular a moving site such as a vehicle. The danger alert system comprises a signal transmitter about a transmitting site for transmitting a signal. The invention further comprises a receiver alert system about a receiving site for receiving the signal emitted by the transmitter about the transmitting site. The receiver alert system then determines the likelihood of danger posed by the transmitting site based upon an analysis of the received signal. The receiver alert system is made up at least one signal receptor adapted for receiving the transmitted signal. The receiver alert system is made up of a velocity measurer, a site locator, and a danger assessor, all in communication with the signal receptors. The velocity measurer determines the relative velocity of the transmitting site from an analysis of the signal. The site locator determines a relative position of the transmitting site from an analysis of the signal.