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I-69 at SR 1/ Dupont Road: Diverging Diamond Interchange Greg Rominger

I-69 at SR 1/ Dupont Road: Diverging Diamond Interchange Greg Rominger Project Manager, Burgess & Niple, Inc. Event Date. Existing Interchange at I-69 at SR1/DuPont Rd. Proposed Diverging Diamond Interchange. Topics. What is a Diverging Diamond Interchange? How does it work?

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I-69 at SR 1/ Dupont Road: Diverging Diamond Interchange Greg Rominger

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  1. I-69 at SR 1/Dupont Road: Diverging Diamond Interchange Greg Rominger Project Manager, Burgess & Niple, Inc. Event Date

  2. Existing Interchange at I-69 at SR1/DuPont Rd

  3. Proposed Diverging Diamond Interchange

  4. Topics • What is a Diverging Diamond Interchange? • How does it work? • How do pedestrians navigate the interchange? • Maintenance of Traffic During Construction • Questions

  5. What is a Diverging Diamond Interchange (DDI)? • It’s an innovative interchange designed to accommodate left-turning movements at signalized, grade-separated interchanges while eliminating the need for left-turn phasing. • Traffic crosses over to the left side of the roadway between the ramp nodes of the interchange. • No opposing traffic for left-turning movements made at the interchange. • Also known as a Double Crossover Diamond (DCD).

  6. How Does a DDI Work?

  7. I-270 & Roberts Rd. in Columbus, OH

  8. Plan View Model

  9. How Do Pedestrians Navigate the Interchange

  10. Pedestrians in the Median

  11. Pedestrians in the Median

  12. Springfield, MO Police Quotes “It’s wonderful. We love it” “We’ve seen drastic reduction in crashes.” “The reconfiguration has alleviated the traffic congestion.” Sergeant Tom Royal, Springfield Police, Traffic Division

  13. Maintenance of Traffic During Construction • How will traffic be maintained? • Will there be any detours? Yes • What is the construction duration?

  14. Maintenance of Traffic During Construction Existing Lane Configuration for SR 1/DuPont Road Bridge over I-69 Stage 1 Construction

  15. Maintenance of Traffic During Construction Stage 2 Construction Stage 3 Construction

  16. Maintenance of Traffic During Construction Stage 4 Construction Final Lane Configuration for SR 1/DuPont Road Bridge over I-69

  17. Maintenance of Traffic During Construction • Will there be any detours? • There will be two weekend closures during construction. These weekend closures will be used to do all of the necessary construction to open the interchange as a DDI. • During the weekend closures, some movements will be required to detour utilizing the newly constructed I-69/Union Chapel Road interchange.

  18. Detour (2 Weekends Only)

  19. Weekend Closures

  20. Maintenance of Traffic During Construction • What is the construction duration? • Begin Construction when weather allows. • Construction Complete by November.

  21. Questions? Toni Mayo INDOT Communications Director INDOT, Fort Wayne District (260) 969-8314 866-227-3555 tmayo@indot.in.gov General Contact Information: Toll Free Number: 866-227-3555 NEinformation@indot.in.gov Project Website: www.in.gov/indot/2894.htm Please Contact: Susan Doell, PE INDOT Project Manager INDOT, Fort Wayne District (260) 969-8263 sdoell@indot.in.gov

  22. Other DDI Projects • First Diverging Diamond in Indiana • DDI’s open • Springfield, MO: I-44 at MO-13 • Springfield, MO: US 60 and National Road • St. Louis, MO: I-270 at Dorsett Road • American Fork, UT: I-15 at Main Street • Alcoa, TN: US 129 Bypass at Bessemer Street • Lexington, KY: New Circle Road (KY 4) at Harrodsburg Road (US 68) • Columbus, OH: I-270 and Roberts Road • Springfield, MO: National Ave. at James River Expressway • Others being considered in Florida, Louisiana, Maryland, Michigan, New Mexico, New York, North Carolina, Ohio, Oregon, and Virginia

  23. Design Considerations • Design Speed • 20-30 mph • Design reverse curves to allow for 25 mph for through traffic • Crossover Geometrics • 40-50 degrees • The higher the better • Curve Radii should be the minimum without superelevation • Lane Width • Width can vary from 12’ up to 15’ • WB-67 typically needs 14’ lanes for side-by-side through movements to navigate the reverse curves • On-ramps • Stop control to avoid crashes due to where through traffic is coming from.

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