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Roadway Geometric Design III: Intersections and Interchanges

COURSE NO: C05-024
COURSE PROVIDER: Gregory Taylor, P.E.
Roadway Geometric Design III: Intersections and Interchanges
Course Highlights

This online engineering PDH course focuses on the geometric design process for modern roads and highways. Subjects covered include: intersections (types/examples, alignment, profile, sight distance, roundabouts); grade separations and interchanges (types, warrants, safety, economic factors). The contents of this course are intended to serve as guidance and not as an absolute standard or rule.


Geometric design is the assembly of the fundamental three-dimensional features of the highway that are related to its operational quality and safety. Its basic objective is to provide a smooth-flowing, crash-free facility. Geometric roadway design consists of three main parts: cross section (lanes and shoulders, curbs, medians, roadside slopes and ditches, sidewalks); horizontal alignment (tangents and curves); and vertical alignment (grades and vertical curves). Combined, these elements provide a three-dimensional layout for a roadway.


This 5 PDH online course is applicable to traffic and transportation engineers interested in learning about the principles to be considered when selecting and designing roadways.

Learning Objectives

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

  • Types and examples of intersections
  • Alignment and profile guidelines
  • Intersection Sight Distance
  • Turning roadways and channelization
  • Auxiliary lane usage
  • Median opening characteristics
  • Roundabout design
  • Intersection design considerations
  • Railroad-highway grade crossings
  • Types of interchanges
  • Warrants for interchanges and grade separations
  • Underpasses
  • Overpasses
Course Document

In this professional engineering CEU course, you need to review the course document titled “Roadway Geometric Design III: Intersections and Interchanges”. This course document is based exclusively on Chapters 9 and 10, Intersections, Grade Separations and Interchanges, of the American Association of State Highway and Transportation Officials (AASHTO) publication, “A Policy on Geometric Design of Highways and Streets” (also known as the “Green Book”).

To view, print and study the course document, please click on the following link(s):
Roadway Geometric Design III: Intersections and Interchanges (1.2 MB)
Course Quiz

Once you complete your course review, you need to take a multiple-choice quiz consisting of thirty (30) questions to earn 5 PDH credits. The quiz will be based on Chapters 9 and 10 of this AASHTO 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: