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Introduction to Roundabouts

COURSE NO: C01-004
COURSE PROVIDER: Gilbert Gedeon, P.E.
Introduction to Roundabouts
Course Highlights

This online engineering PDH course distinguishes modern roundabouts from older style traffic circles both in how they operate and in how they are designed. It also defines the six basic types of roundabouts:

  • Mini-roundabouts
  • Urban compact roundabouts
  • Urban single-lane roundabouts
  • Urban double-lane roundabouts
  • Rural single-lane roundabouts
  • Rural double-lane roundabouts


Traffic circles have been part of the transportation system in the United States since 1905 when the Columbus Circle designed by William Phelps Eno opened in New York City. The prevailing designs enabled high-speed merging and weaving of vehicles, as priority was given to entering vehicles, resulting in congestion and frequent collisions.


In 1966, the United Kingdom adopted a mandatory “give-way” rule at all circular intersections, which required entering traffic to give way, or yield, to circulating traffic. In addition, smaller circular intersections were proposed that required adequate horizontal curvature of vehicle paths to achieve slower entry and circulating speeds. These changes improved the safety characteristics of the circular intersections by reducing the number and particularly the severity of collisions.


This 1 PDH online course is applicable to traffic engineers, transportation planners, conceptual and detailed designers, and other technical professionals who are involved in the design and construction of roundabouts.

Learning Objectives

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

  • Defining physical features of roundabouts
  • Learning the key dimensions
  • Distinguishing roundabouts from other circular intersections
  • Understanding the different categories of roundabouts
  • Familiarizing with the basic design characteristics for each type
Course Document

In this professional engineering CEU course, you need to review Chapter 1, “Introduction”, of the Federal Highway Administration Publication FHWA-RD-00-067, "Understanding Roundabouts".

To view, print and study the course document, please click on the following link(s):
Introduction to Roundabouts (847 KB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of ten (10) questions to earn 1 PDH credit. The quiz will be based on Chapter 1 of 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 may print your Certificate of Completion after we receive your payment.) For your convenience, we will also email you your Certificate of Completion. Also, 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: