Wednesday, April 22, 2015
Mary Sullivan, Communications
Sometimes it takes a couple of times to get things just right when doing something the first time. A few details are tweaked here and there, lessons are learned, and feedback is responded to. After a few trial runs, methods are perfected until a product is produced seamlessly. But every once in a while—through the persistence of a detail-oriented team—the nail is hit right on the head. Such was the case for Project Manager Kelly Turner and his team’s work on the Route 65 and Battlefield Road diverging diamond interchange (DDI) project in Springfield, Missouri. The project is scheduled to be complete by this fall.
It was the Transportation team’s first time working with a DDI, an up-and-coming design that improves interchange flow. A DDI uses traffic signals, gentle curving lanes, and striping to route drivers to the opposite side of the road. DDIs eliminate left turns against traffic, and, once through, brings drivers safely back to the correct side of the road.
Not many consultants have worked with the DDI design since it is still a relatively new concept in the transportation industry. However, upon delivering the design to the contractor and a third-party reviewer, Olsson received high praise for its work on the plans.
“We now certainly have a chip to play in future DDI project pursuits, and we have the ability to confidently present ourselves as experts,” Kelly said. “We should also remember this as a potential recommendation or solution to projects.”
The bridge at Route 65 and Battlefield Road had been scheduled for replacement because of deterioration and non-compliant freeway clearance. Kelly said the DDI design was requested for several reasons that included the following:
In addition to being the lead consultant for the project, Olsson provided the following design elements:
Kelly also noted four specific design solutions the team developed that provided great benefits to the project:
“I am so proud of the job the team has done and continues to do during construction,” Kelly said. “Both MoDOT and the contractor have heaped praise and thanks upon our team for our work on this project.”
Update December 2015: Springfield's Diverging Diamond project was completed in the fall of 2015.