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Useful Links

Wikipedia Entry on DDI

Video of Diverging Diamond in St. Louis

Federal Highway Administration Evaluation of the Diverging Diamond

Fact Sheet for Drivers

Project and construction phases (Presentation)

Completed project drawing

Right of Way impacts and limits

SB I-29 Ramp Closure Detour

NB I-29 Ramp Closure Detour

Informational handout



Project Status: Traffic is moving in the diverging diamond configuration. Work continues through August.

Why is MoDOT and the City of Kansas City Doing this Project?

The I-29 and Tiffany Springs Parkway Interchange is part of a growing area of Kansas City, Mo. The close proximity to Ambassador Drive and current and future development have created capacity and safety issues in the area.


How does this project benefit me?

The purpose of this project is to improve traffic safety and traffic flow, provide better access, and accommodate economic development.

The interchange is being converted from a standard Diamond Interchange into what’s known as a Diverging Diamond Interchange. In this configuration, traffic crosses from the right side of the road to the left side at two signalized intersections on either side of the interchange.  These crossovers allow for free flowing right‐turns in advance of the cross‐overs, and free flowing left‐turns between the cross‐overs. This enhances the safety and capacity of the interchange while keeping the costs of reconfiguration to a minimum.

Additionally, N.W. Prairie View Road will be expanded to four‐lanes south of Tiffany Springs Parkway, and will connect directly with N.W. Congress creating an alternative route to the Recreation Complex, Zona Rosa shopping areas, and the business district along Barry Road.  An additional lane will also be added to I‐29 both north and southbound, between Route 152 and Tiffany Springs Interchanges.

What is the project schedule?

This project was awarded to Emery Sapp and Sons, Inc. Work has started and is scheduled through September 2014.

The current plan keeps interchange open throughout construction except for a couple of short-term closures (2 to 4 weeks each) of the ramps on the north side of Tiffany Springs Parkway. During construction of the northbound on‐ramp, traffic will be detoured on Ambassador Drive to 112th Street, and back on to northbound I‐29.
When the southbound off‐ramp is closed, traffic will exit at 112th Street and use N.W. Prairie View Road to access Tiffany Springs Parkway.

All other roadways will remain accessible to at least one lane of traffic in each direction throughout construction.

How much does this project cost?

This project is part of the KCI Corridor TIF improvements planned for the area.  The TIF exists to enhance development opportunities and support growth through investment in infrastructure needed to foster and sustain that growth. MoDOT has partnered with the KCI Corridor TIF, as has the Kansas City Aviation Department to fund the $14 million project.

How do I learn more?

For more information, review the materials listed in the right column. You can also sign up for e-mail updates. Please send us your request at kccustomerrelations@modot.mo.gov.

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