RRFBs: A Proven Approach to Pedestrian Crossing Safety
The Problem: When a Crosswalk Isn’t Enough
Most pedestrian safety conversations start with a location, not a product. A marked crosswalk is already in place. Signage meets requirements. The layout checks out. But drivers are not consistently yielding, and pedestrians know it. That is usually when the question comes up. What is the right next step that improves safety without stepping all the way up to a signalized intersection.
That gap between a marked crossing and a full signal is where most real world pedestrian issues exist.
What RRFBs Are Designed to Do
Rectangular Rapid Flashing Beacons, or RRFB systems, are a traffic control device used at uncontrolled pedestrian crossings to improve driver awareness and increase yielding compliance.
They are commonly used at midblock crossings, school zones, shared use paths, and unsignalized intersections where pedestrian activity is present but does not justify full signal control.
What makes an RRFB system effective is not just that it flashes. It is how it flashes. The rapid and irregular flash pattern stands out immediately to drivers in a way that standard warning beacons do not. That difference leads to earlier recognition of the crossing and more consistent driver response when a pedestrian is present.
MUTCD and FHWA Guidance
RRFB systems are deployed under FHWA Interim Approval IA-21 and are recognized within the Manual on Uniform Traffic Control Devices as a supplemental treatment for uncontrolled pedestrian crossings. They are intended to enhance existing pedestrian warning signs and pavement markings rather than replace traffic signals.
The FHWA guidance allows agencies to use RRFB systems at marked crosswalks where additional visibility is needed and where traditional traffic control devices are not achieving the desired level of driver compliance. For engineers and decision makers, this provides a solution that is both effective in the field and aligned with federal standards.
Measured Performance
RRFB systems continue to be used because they produce measurable results. FHWA studies show that driver yielding rates can increase from approximately 20 percent before installation to as high as 80 to 96 percent after installation.
These improvements have been observed across different roadway types and during both daytime and nighttime conditions, making RRFB systems a reliable option for improving pedestrian crossing safety.
Installation Considerations
The challenge is often not whether to use an RRFB system, but how to install it within existing constraints. Limited access to power, restrictions on trenching, and existing infrastructure all impact deployment.
Encom Wireless RRFB systems are designed to address these conditions. Wireless communication between both sides of the crossing removes the need for trenching. Solar powered configurations provide a reliable option where utility power is not available. The system remains synchronized and can be installed with minimal disruption.
Evaluate Your Next Crossing
If you are reviewing a location where drivers are not consistently yielding and signalization is not the right fit, an RRFB system is worth evaluating. When applied in the right location, it provides a clear and measurable improvement in pedestrian safety and driver compliance.
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Sources
Encom Wireless. Rectangular Rapid Flashing Beacon (RRFB) Systems.
https://www.encomwireless.com/
Federal Highway Administration. Interim Approval for Optional Use of Rectangular Rapid Flashing Beacons (IA-21).
https://www.fhwa.dot.gov/trafficinfo/ia21/
Federal Highway Administration. Evaluation of Rectangular Rapid Flashing Beacons (RRFBs) at Uncontrolled Crosswalks.
https://www.fhwa.dot.gov/publications/research/safety/10043/
Federal Highway Administration. Manual on Uniform Traffic Control Devices (MUTCD).
https://mutcd.fhwa.dot.gov/