A traffic indicator warning unit for preventing collisions in blind corners has a weather-resistant chassis, a rechargeable battery within the chassis configured to power the unit, an indicator assembly mounted to the chassis comprising a first indicator light configured to indicate to a driver to stop and wait, and a second indicator light configured to indicate to a driver that the unit is non-operational, and further a motion-detector mounted to the chassis, configured to detect a moving vehicle near the unit, a metal detector mounted to the chassis, configured to detect the metal in a vehicle near the unit, and a transmitter/receiver within the chassis having an antenna, wherein the transmitter/receiver is configured to communicate with one or more other traffic warning units. A method of use of a traffic indicator warning system for a blind corner system is also disclosed.