RRFB

Why this pattern exists

An uncontrolled crosswalk relies entirely on driver attentiveness and willingness to yield; an RRFB gives the crossing a strong, attention-getting visual cue exactly when a pedestrian or cyclist is present, without the cost and delay of a full traffic signal. This pattern exists to document this lighter-weight treatment and where it fits relative to a full signal or hybrid beacon.¹

Key considerations

• Most effective at midblock or lower-volume crossings where a full signal is not warranted but a marked crosswalk alone yields inconsistent results²³
• User-activated designs (push button or passive detection) should be reliable and low-friction to use; a device people cannot easily activate will not get used
• Should be paired with adequate crosswalk marking and, where relevant, a refuge island rather than deployed as a standalone fix

Related patterns

Crosswalk (ELM-CRW-08) (the crossing this pattern supports); Pedestrian Hybrid Beacon (ELM-PHB-18) (a stronger-control alternative for busier crossings); Traffic Signal (ELM-TFS-14) (the higher-control alternative this pattern is meant to avoid triggering)

References

1. Legal / regulatory MUTCD 11th Edition with Revision 1 (FHWA, December 2025; effective March 5, 2026). Formerly Interim Approval IA-21, now standardized.
2. Evidence-based NCHRP Research Report 841 (2017), "Development of Crash Modification Factors for Uncontrolled Pedestrian Crossing Treatments," Transportation Research Board. Documents a crash modification factor of 0.53 for vehicle-pedestrian crashes.
3. Evidence-based Fitzpatrick, K. et al., "Will You Stop for Me?," Report No. TTI-CTS-0010, Texas A&M Transportation Institute (2016). Driver-yielding research underlying its particular effectiveness at multilane crossings.