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Safety Evaluation of Centerline and Shoulder Rumble Strips

COURSE NO: C04-048
COURSE PROVIDER: Gilbert Gedeon, P.E.
Safety Evaluation of Centerline and Shoulder Rumble Strips
Course Highlights

This online engineering PDH course describes the strategy involving the application of shoulder rumble strips (SRS) and centerline rumble strips (CLRS) in combination. This strategy is intended to reduce the frequency of crashes by alerting drivers that they are about to leave the travelled lane. While research has been published on the safety effectiveness of SRS or CLRS used in isolation, the effectiveness of the combined treatment has not been shown.


Geometric, traffic, and crash data were obtained at treated two-lane rural road locations in Kentucky, Missouri and Pennsylvania. To account for potential selection bias and regression-to-the-mean, an Empirical Bayes (EB) before-after analysis was conducted using reference groups of untreated two-lane rural roads with similar characteristics to the treated sites. A slightly different approach was required for the analysis of the treatment sites in Missouri, which is installing rumble strips on two-lane rural roads whenever a resurfacing project is undertaken. As a result, a suitable reference group with no rumble strips for this road type presently or in the near future did not exist. The analysis also controls for changes in traffic volumes over time and time trends in crash counts unrelated to the treatment.


This 4 PDH online course is intended for traffic engineers, design professionals and construction personnel who are involved in the design and application of centerline and shoulder rumble strips.
Learning Objectives

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

  • Understanding the background information about the strategy and the study
  • Familiarizing with previous research of SRS and CLRS
  • Learning about the Empirical Bayes (EB) methodology used for the evaluation
  • Understanding the data collection of the three States in study
  • Familiarizing with the SPFs developed for each State
  • Familiarizing with the before-after evaluation results of crashes
Course Document
In this professional engineering CEU course, you need to review the document “Safety Evaluation of Centerline and Shoulder Rumble Strips” prepared by the U.S. Department of Transportation, Federal Highway Administration FHWA-HRT-15-048, June 2015.
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 the entire document.
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: