Better Roadway Design - Intersections (RV-7295)
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 reaction times and driver performance that may not be realistic. 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 interactive online course covers the subjects of 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.
Health, Safety and Welfare
At the conclusion of the course, you will understand:
•The importance of reducing the skew at intersections to values less than those recommended by AASHTO
•How the receiving lane width for turning movements can impact the safety of the intersection
•How channelization at intersections can improve safety
•The methodology used to develop intersection sight distance recommendations and how these values should be modified to improve the safety of the intersection
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