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.
Abstract: Interior is vacant, as if in reserve for grade separation, but it's already next to a freeway. Interior could be filled with development without hindering its function much at all.
Abstract: Among the most pedestrian friendly atmospheres in the Country. This Couplet moves a lot of traffic, but at a slow, steady pace rather than stop and go. Tons of restaurants - very popular.
Abstract: This is a good example of how a CD system can reduce pressure on cross streets that have bridges. The Texas U-Turn at bridges makes it simple for one-way traffic to cross over the freeway and return to where they came from.
