• Rectangular Rapid Flashing Beacon (RRFB)

  
  
Description
  
  
  
ApprovalLetter.PDF
  
NCDOT Approval letter for use of RRFB, IA-11-38 (Terminated)
R42FHWA2010
ApprovalRRFB.pdf
  
NCDOT request for approval to use RRFB
R42J.K. Lacy, P.E., State Traffic Engineer2010
Interim_IA-11.pdf
  
FHWA Interim Approval for use of RRFB, IA-11 (Terminated)
R42FHWA2008
FHWA FAQ.aspx
  
FAQ related to Interim Approval IA-21
R42FHWA2008
IA-21 - Interim RRFB Letter.pdf
  
NCDOT request for approval to use RRFB
R42J.K. Lacy, P.E., State Traffic Engineer2018
IA-21 RRFB Approval Letter.pdf
  
NCDOT Approval letter for use of RRFB, IA-21.43
R42FHWA2018
Interim_IA-21.pdf
  
Interim Approval for use of RRFB, IA-21
R42FHWA2018
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