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Minimum Retroreflectivity Levels for Blue and Brown Traffic Signs

COURSE NO: C04-046
COURSE PROVIDER: Gilbert Gedeon, P.E.
Minimum Retroreflectivity Levels for Blue and Brown Traffic Signs
Course Highlights

This online engineering PDH course describes the research activities and consequent findings related to the development of recommendations for maintained retroreflectivity (MR) levels for white-on-blue signs and white-on-brown signs. It also includes an investigation related to MR levels needed for complex visual conditions that include glare from oncoming headlamps and fixed roadway lighting.


In 2003, the Federal Highway Administration published research recommendations for minimum MR levels for traffic signs. The recommendations included most sign types but not white-on-blue signs or white-on-brown signs. In addition, the 2003 MR levels were based on conditions representing dark rural environments.


This 4 PDH online course is applicable to all traffic engineers, transportation planners, sign manufacturers and all personnel interested in learning about or who are involved in the planning and determination of minimum retroreflectivity levels for traffic signs.


Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Understanding research objectives and activities
  • Learning about minimum retroreflectivity, glare and surround complexity
  • Understanding the experimental variables, luminance levels and environmental conditions
  • Evaluating experimental results of white-on-blue signs vs. white-on-brown signs
  • Learning about the luminance threshold levels and minimum retroreflectivity levels
Course Document

In this professional engineering CEU course, you need to review the Federal Highway Administration (FHWA) no. FHWA-HRT-08-029, "Minimum Retroreflectivity Levels for Blue and Brown Traffic Signs", April 2008.

To view, print and study the course document, please click on the following link(s):
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of twenty (20) questions to earn 4 PDH credits. The quiz will be based on this FHWA publication.
The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

To buy the course and take the quiz, please click on: