The RRFB is an economical, easy-to-install pedestrian safety measure that increases motorist yielding. The LightGuard Systems RRFB uses high-intensity LEDs (light-emitting diodes) located on both the RRFB front and sides, to alert drivers of pedestrians in a crosswalk in real-time. It flashes at a highly visible MUTCD approved on/off rate that demands motorists’ attention.