What is a Rectangular Rapid Flashing Beacon and what does it mean?

Nighttime effectiveness of the pedestrian hybrid beacon, rectangular rapid flashing beacon, and LED-embedded crossing sign - ScienceDirect

Saving Our Rectangular Rapid Flashing Beacons Means Saving Lives - Forward Pinellas

Rectangular Rapid Flashing Beacons (RRFB)

New Rapid-Flashing Beacon Shows Great Promise in Improving Pedestrian Safety — Texas A&M Transportation Institute

These RRFB Crosswalk Packages contain everything you need, except for the signs and poles, to install a RRFB (Rectangular Rapid Flashing Beacon)

RRFB Push-Button Activated Crosswalk Packages

Rectangular Rapid Flashing Beacons (RRFBs) – Official Website of Arlington County Virginia Government

Rectangular Rapid Flashing Beacons

This product is only for one side of the street, for single sided applications.This Solar LED Rapid Flashing Beacon with Push Button Activation is

Single Solar Horizontal Rapid Flashing Beacon with Push Button Activation

Rapid flashing lights make pedestrian crossings safer

Rectangular Rapid Flashing Beacons (RRFB) - City of Chilliwack