On 12/2017 FHWA terminated the Rectangular Rapid Flashing Beacon (RRFB) IA-11 due to patent dispute. On 3/20/2018 FHWA came out with a new Interim Approval IA-21 to reinstate the use of RRFBs. There are differences to the two interim approvals so please refer to MUTCD regulations.
Temporary Rectangular Rapid Flashing Beacon (RRFB) System. Portable pedestrian safety for temporary crosswalks.
MUTCD compliant to can be combined with many options TraffiCalm’s SA328
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