Better Roadway Design - Intersection Signing
Roadway design is commonly based on minimum AASHTO (American Association of State Highway and Transportation Officials) and state DOT (Department of Transportation) design standards. However, these design standards are based on some assumptions of driver performance that may not be realistic, particularly as our population ages. The Federal Highway Administration has published a design handbook that provides substantially different guidance than that commonly prescribed by AASHTO and state DOT's.
This 3-hour online course covers the subjects of signing at roadway intersections in the FHWA document. The recommendations of FHWA can generally be implemented very economically. While the AASHTO and state DOT standards remain the minimum standards, the designer should recognize that they are just that - minimum standards. Designs can be improved by following the guidance in this course.
There is a test included at the end of this course.
At the conclusion of the course, you will understand:
- Some of the problems associated with left-turn lane geometry and how appropriate signing and median design can reduce driver errors
- How good street-name signing can improve the safety of intersections
- Some of the problems associated with one-way roadways and signing at intersections and how to improve safety of these intersections
- The means of using additional signs at stop-controlled intersections to improve safety by changing driver expectations
- AEC Complete
This course can be used for CE or applies to the State Licenses and Professional Organizations listed below.
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Click on the state to expand the license or professional organization that applies to the course.
Mr. Peterson has a BS and MS from Montana State University and more than 28 years of engineering experience in hydrology and hydraulics. He is currently a senior engineer with Kadrmas, Lee and Jackson and has worked extensively in both the private sector and in state government. He is licensed as a PE in MN, MT, ND, SD and WY. He was chairman of a three-person committee that re-wrote the Hydraulics Manual for the Montana Department of Transportation and authored the storm water regulations for subdivisions in Montana. He also teaches a two-day course on Introduction to Detention Pond Design for the American Society of Civil Engineers throughout the U.S.
I had to look in an FHWA website to make certain that a "positive offset" w…
By John M. (Engineer) on March 6, 2018
I had to look in an FHWA website to make certain that a "positive offset" was what I thought. They have a very clear Figure 1 that would be helpful if included in the lesson. Also, several check point answers are in metric unit units only, whereas in English units on the exam. Please use either just English units (or both) in the check points.
This course was based on older data.
By Sharon B. (Engineer) on December 17, 2017
This course was based on older data. Comparison to current accident analysis would be interesting. Also, descriptions of signage and accident analysis were hard to follow without diagrams and charts. If they were in the text, several did not show up on my system.
Much of the data references seems to be dated from the 1990s - not sure if …
By David S. (Engineer) on December 10, 2017
Much of the data references seems to be dated from the 1990s - not sure if there are more recent data sources?