The Perimeter CIDs initiated the DDI project in 2009 when they spent $100,000 to hire an engineering firm to find an interim solution to backups at the interchange. The PCIDs secured funding for project design and engineering from the State Road and Tollway Authority and DeKalb County. That projected cost to date totals $824,423. GDOT is funding the $4.6 million cost of the DDI construction.
That same year, Missouri built the first diverging diamond, and it has proved to be a big hit, said Don Saiko, a project manager for the Missouri Department of Transportation.
After the first interchange opened in Springfield, four more were quickly added. An additional half dozen are either under construction or in the planning stages.
Saiko said backups at the Springfield interchange on I-44 would sometimes reach three miles. Now, he said, there are no backups.
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