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Road Diet Informational Guide

COURSE NO: C04-061
COURSE PROVIDER: Gilbert Gedeon, P.E.
Road Diet Informational Guide
Course Highlights

This online engineering PDH course provides information on the design and post-implementation evaluation of Road Diets, and presents the decision-making process that helps practitioners determine whether Road Diets are a good fit for a certain corridor.


Four-lane undivided highways have a history of relatively high crash rates as traffic volumes increase and as the inside lane is shared by higher speed through traffic and left-turning vehicles. One option for addressing this safety concern is a “Road Diet.” A Road Diet involves converting an existing four-lane undivided roadway segment to a three-lane segment consisting of two through lanes and a center two-way left-turn lane (TWLTL). The reduction of lanes allows the roadway cross section to be reallocated for other uses such as bike lanes, pedestrian refuge islands, transit stops, or parking.


A Road Diet improves safety by including a protected left-turn lane for mid-block left-turning motorists, reducing crossing distance for pedestrians, and reducing travel speeds that decrease crash severity. Additionally, the Road Diet provides an opportunity to allocate excess roadway width to other purposes, including bicycle lanes, on-street parking, or transit stops.


This 4 PDH online course is applicable to transportation engineers who are interested in improving safety and reducing highway fatalities through the use of proven safety countermeasures including Road Diets.
Learning Objectives

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

  • Familiarizing with the basics of Road Diets
  • Understanding the multidimensional benefits of Road Diets
  • Learning about the geometric and operational designs of Road Diets
  • Gaining a general overview on how to conduct a safety and an operational analysis to determine if the Road Diet is effective
  • Exploring various case studies on feasibility determination decision-making
Course Document
In this professional engineering CEU course, you need to review the course document titled, "Road Diet Informational Guide”, which is based on the FHWA document “Road Diet Informational Guide”, reference FHWA-SA-14-028.
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: