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Transportation - Roundabout Traffic Circles

Engineer's, here is our online continuing education course material from the Department of Transportation (DOT) and the Federal Highway Adminintration. You will earn 13 PDH continuing education training hour upon conclusion of the CEU Leaf quiz.

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The modern roundabout was developed in the United Kingdom to rectify problems associated with these traffic circles. In 1966, the United Kingdom adopted a man- datory give-way rule at all circular intersections, which required entering traffic to give way, or yield, to circulating traffic. This rule prevented circular intersections from locking up, by not allowing vehicles to enter the intersection until there were sufficient gaps in circulating traffic. In addition, smaller circular intersections were proposed that required adequate horizontal curvature of vehicle paths to achieve slower entry and circulating speeds.

This PDH continuing education course provides information and guidance on roundabouts, resulting in designs that are suitable for a variety of typical conditions in the United States. The scope of this guide is to provide general information, planning techniques, evaluation pro- cedures for assessing operational and safety performance, and design guidelines for roundabouts.

Engineer Learning Objectives:

  • Understand key physical features and dimensions
  • Know the difference between roundabouts from other circular intercentions
  • Knowledge of roundabout categories
  • Importance of policy considerations
  • Ability to plan project
  • Ability to design roundabout given entry lanes, intersection types, space limitations, and performance criteria
  • Understanding of operation
  • Safety considerations
  • Geometric design principals
  • Traffic design
  • Landscaping considerations
  • Overall system considerations

This is a handout style continuing education PDH class that comprehensively reviews the publication.

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Online Format:

     Handout / Attachment

PDH Hours:


Engineer PDH Price: $247.50

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"Your concept of 'online' PE courses is both a timely and reasonably priced alternative. I wish I'd found CEU Leaf years ago."

David G. Gardner, P.E.

SVP (retired), Everett Prescott, Inc.

Gardiner, ME

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