Fog collision-avoidance warning device

The introduction of 4-way flasher hazard warning switches in cars has helped a great deal in reducing collision pile-up accidents. However, in dense fog this system is inadequate, despite the use of bright rear light fog lights, recommended when vision is less than 150 ft. Low cost car theft alarm actuators operate in the 430 MHz frequency range and have an action radius of about 300 ft. A 430 MHz transceiver in cars coupled to the 4-way flasher control switch could be used. When this switch is on, that is the flasher is working, the transmitter is active within a radius of about 300 ft. When the switch is off, the normal position, the transceiver is in the receive mode. The first cars to approach a hazard will normally actuate their 4-way flashers, thus transmitting the danger signal to cars behind them. The received signal will cause the indicator switch of the 4-way hazard flashing control to flash, or provide some other warning, thus notifying the following cars of a possible hazard ahead.