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US-50 and MO-291 S Interchange Improvements

Posted on Posted in Project

Lee’s Summit, MO

A divergabout, a brand-new layout which includes a diverging diamond cross-over at one ramp terminal and a roundabout at the other, was chosen to alleviate traffic issues at this busy interchange and provide stakeholders with long-term time and cost savings.
GBA was hired to refine and optimize this unique concept. Details like bridge skews,ramp alignments,roundabout geometrics, lane widths, signal spacing and signage were all studied to ensure the constructed interchange would be successful.

The scope of GBA’s role in the project included development of preliminary, right-of-way and final plans, which included optimizing the interchange layout, designing two bridges, four retaining walls,ramp and intersection reconstruction and improvements, a frontage road realignment, storm sewer design, pavement marking and signing. GBA also oversaw and provided quality control for lighting and signal design. Improvements also included pavement upgrades to Route 291 and US-50, including widening and shoulder reconstruction.

GBA’s key objectives were to optimize the traffic operations with lane balancing and geometric design, to develop an easily constructible project while maintaining traffic during construction and engage regional stakeholders to provide the right access for future development and understand existing property owners’ concerns.

Client Contact

Missouri Department of Transportation, Kansas City District

Cost/Project Size

$11.6 million

Completion Date



APWA Kansas City, Public Works Project of the Year, 2018
ACEC of Missouri, Engineering Excellence, 2018
CPG, Excellence in Concrete, 2018
KCITE, Excellence in Transportation, 2018
MOVITE Transportation Achievement Award for Operations, 2019