Diverging Diamond/Double Crossover Diamond Interchange
Diverging Diamond/Double Crossover Diamond Interchange
Tuesday, February 9, 2021 9:00 AM - Wednesday, February 10, 2021 5:00 PM (EST)
Description
BackgroundThe Diverging Diamond, or also called the Double Crossover Diamond has become a favored interchange in the US and Canada. There are more than 100 that are open to traffic, in design or under construction. Because of their potential increased capacity and crash reduction Departments’ of Transportation and the Federal Highway Administration in the US have embraced this new interchange form. Participants in the course have the opportunity to learn from the early experiences and research in the US and Canada. Over the past 6 years Joel Leisch has planned and designed 5 Diverging Diamonds/ Double Crossover Diamonds and participated in the USDOT/FHWA research project to investigate the appropriate geometric design features related to traffic operations and safety.
Course Description
The course is a 2 - day professional development course for transportation planners, traffic engineers and highway designers. It is an advanced level course for those with at least two years of experience and an appropriate educational background. The course contains lectures, demonstrations, and problems (projects) for maximum involvement and understanding by the participants. The topics include:
- History of the evolution of diamond interchanges and lessons learned
- Signalized intersection operational analysis/lane determination procedures based on the most recent procedures in the Highway Capacity Manual applied to the Diverging Diamond
- Overview of Interchange design study procedures with examples
- New and Innovative interchange forms with detailed emphasis on the Diverging Diamond and its application
- Geometric design of the Diverging Diamond
- Accommodation of Pedestrians, Bikes and Public Transport – Diverging Diamond
- Operations and signalization – Diverging Diamond
- Signing and pavement marking – Diverging Diamond
- Projects (problems) to demonstrate the participants understanding and application of the concepts and procedures including: 1) Operational analysis and lane determination, 2) alignment design, crossover intersection spacing with application of the design criteria for the Diverging Diamond interchange.
Through the lectures and projects/problems participants will understand the relationship between design, traffic operations, and safety. The participants will learn that designing an interchange requires knowledge of planning, geometric design and traffic operational analysis. Participants will learn that every interchange has individual issues and opportunities which require sensitive application of the design criteria to respond to these issues and opportunities – interchange design is not “cookbook.” The lectures and projects/problems will give the course participants the experience to develop the best interchange form specifically the Diverging Diamond for the site conditions efficiently and economically.
The course is structured for 20-30 participants for maximum participant/instructor interaction. The course materials, lectures and projects/problems are in both US Customary and metric units. Each participant in the course will receive a set of reference materials in a 3-ring binder for use during the course and after. The reference materials are approximately 200 pages of text, figures, tables, and photographs for use during the course and after. Total classroom hours - 14
Participants should have - pencils, note paper, a pocket calculator, and a scale to accomplish course projects (problems).
Instructor: Joel P. Leisch, PE, MSCE, BSCE, LMITE, FASCE
Mr. Leisch has been engaged in transportation and traffic engineering with an emphasis on conceptual planning, functional design, geometric design, and traffic operational studies for urban freeway corridors and other high type urban facilities for more than 50 years. He has been responsible for the planning and design studies of more than 2,000 miles (3,000km) of freeways, toll facilities, and arterials including more than 900 interchanges and 2,000 intersections in major metropolitan areas in 28 states and four foreign countries. During the past 10 years a number of the freeway projects have incorporated high-occupancy vehicle (HOV) facilities, managed (HOT) lanes, surveillance and control, integration with public transportation (BRT or rail) and application of innovative interchange concepts as the Double Crossover Diamond (Diverging Diamond) and the Displaced Left Turn Interchange in environmentally and socially sensitive areas. Recent arterial Intersection projects have included application of the Crossover Displaced Left Turn Intersection, innovative two-level intersections and roundabouts.
Pricing
ACEC Georgia Members - $125
Nonmembers - $250
ACEC Georgia Members - $125
Nonmembers - $250
Tuesday, February 9, 2021 9:00 AM - Wednesday, February 10, 2021 5:00 PM
(EST)
February 9, 2021
9:00-9:30am - Welcome and Course Introduction
9:30-10:15am - Lecture – History and Evolution of Diamond Interchanges and Lessons Learned
10:15-10:30am - Break
10:30-11:45am - Lecture – Introduction to the Diverging Diamond / Double Crossover Diamond with video and Introduction to Projects
11:45-12:45pm - LUNCH
12:45-1:45pm - Lecture – Interchange Selection Process
1:45-2:00pm - Break
2:00-3:15pm - Lecture – Capacity Analysis / Lane Determination – Diverging Diamond / Double Crossover Diamond
3:15-3:30pm - Break
3:30-5:00pm - Project – Operational Analysis / Lane Determination
February 10, 2021
9:00-10:00am - Lecture – DDI/DCD – Operational Characteristics
10:00-10:15am - Break
10;15-11:30am - Lecture – DDI /DCD – Geometric Design
11:30-12:00pm - Project – DDI/DCD – Geometric Design
12:00-1:00pm - Lunch
1:00-2:00pm - Project – DDI/DCD – Geometric Design
2:00-2:15pm - Break
2:15-3:00pm - Lecture – Pedestrians, Bikes, Public Transport
3:00-3:15pm - Break
3:15-4:30pm - Lecture-Signing and Pavement Marking and Project Examples
4:30-5:00pm - Course Summary and Closing
Registered Guests
11
11
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