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For more information, please contact Project Manager Tim Richmond at (573) 472-5290, Resident Engineer Matt Malone at (573) 431-4933 or MoDOT's Customer Service Center toll-free at 1-888-ASK-MODOT (1-888-275-6636).

August 03, 2011 02:21 PM
Commission Awards Contract to Construct DDI in Farmington
New Interchange at Intersection of Routes 221, W & 67

SIKESTON - The Missouri Highways and Transportation Commission awarded a contract during its regular meeting today to construct a diverging diamond interchange (DDI) in Farmington. The $3,344,748 contract was awarded to Emery Sapp & Sons Inc., Columbia, Mo.

The project includes constructing a DDI at the intersection of Routes 221, W and 67.

Additionally, the bridge will be re-decked and striped for four lanes of traffic and access changes will be made to Walker Drive.

"The DDI has the potential to increase safety and reduce delays in this area," said Project Manager Tim Richmond.

He explained a DDI has fewer potential conflict points than a traditional interchange and reduces the likelihood of rear-end crashes by allowing traffic to move more steadily.

The signalized intersections will have two-phase signals with short cycle lengths.

Constructing a DDI is also more cost effective than traditional reconfiguration methods. 

"With the current state of transportation funding, finding innovative solutions to meet demands and produce a cost savings is critical," said Richmond.

A DDI requires fewer lanes to provide the same vehicle capacity as a traditional interchange, making it unnecessary to purchase as much right of way.

Weather permitting, work could begin as early as fall 2011, with completion anticipated in fall 2012.

As construction is underway, motorists should expect traffic shifts and width restrictions on Route 221 and Route W. Motorists should also watch for equipment crossings, which could cause delays periodically.

Route 67 travelers will encounter lane closures, reduced speeds and yield conditions at on-ramps during various phases of the project.  These conditions will arise as work takes place on the bridge.

Work zones will be marked with signs as work is underway.  Drivers are urged to use extreme caution near the work zone and plan for possible delays.

For more information, please contact Richmond at (573) 472-5290, Resident Engineer Matt Malone at (573) 431-4933 or MoDOT's Customer Service Center toll-free at 1-888-ASK-MODOT (1-888-275-6636). A video simulation of the DDI is available at: http://www.youtube.com/watch?v=CEEeDf9gQNc

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