Abstract: Nice example of at-grade opposing quadrants. More like jug-handles, but if it were a little larger it could have interior development which allows access from the quadrant roadway.
Abstract: DDI openned in 2014. At 2 nearby intersections, left turns onto Poplar Tent Rd are restricted by superstreet designs, with one loon on either side of I-85.
Abstract: I-485 will be completed as a beltway around Charlotte with a couple of new interchanges. The interchange at this location will be a DDI. Originally planned for a 10 lane SPUI bridge with failing LOS, I was able to convert this to a 7 lane DDI with LOS D or better for all movements in the design year.
Abstract: Another DDI in Springfield. Because the DDI is such a cost efficient solution, the Springfield area has been able to afford fixing many of their interchanges into DDIs.
Abstract: New interchanges were considered at this location in 2005, with the widening of both Hanover Road and MD 295. The DDI was not selected as the chosen alternative because state officials did not want the first DDI in Maryland to go in a location where there would be a lot of unfamiliar drivers. This new interchange is planned to be the entrance to the rental car facility for BWI Airport.
Abstract: Opened Summer 2010. Followed the success of the Springfield, Missouri DDIs. This location was planned for a DDI, before Springfield considered the DDI concept.
Abstract: Opened in summer 2010. Second DDI opened to traffic in Springfield, which was also the second DDI to open in the US. Interchange got the go ahead to become a DDI after the success of the I-44/Route 13 DDI farther north in the city.
Abstract: 1st Planned Diverging Diamond in Missouri, but construction was delayed. Still will be the first DDI in the Kansas City area, but will be at least the fourth DDI in the state.
