Previous Pedestrian Crossing RRFB Reports
Several methods have been used to emphasize the presence of a pedestrian crossing, including methods with beacons or embedded light-emitting diodes (LED). A device that has received national attention is the rectangular rapid-flashing beacon (RRFB). On July 16, 2008, the Federal Highway Administration (FHWA) provided interim approval (formally listed as IA-11) for the optional use of rectangular rapid-flashing beacons.
FHWA approved the use of this device at pedestrian and school crosswalks across uncontrolled approaches and defined it in IA-11, which they then replaced with IA-21. This is understood as the following: an RRFB shall consist of two rapidly and alternately flashing rectangular yellow indications having LED-array based pulsing light sources, and shall be designed, located, and operated in accordance with the detailed requirements specified” in the interim approval. RRFBs appear to be different from previously-used pedestrian crossing treatments, displaying noteworthy characteristics that seem to produce improved vehicle stopping and yielding behaviour to pedestrians.
The use of LEDs appears to provide greater brightness, which could improve recognition.
(FHWA Technical Report HRT-15- 043)