The Wisconsin Department of Transportation is building Diverging Diamond Interchanges (DDIs) at key highway interchanges across the state. This innovative interchange, sometimes called a “double crossover diamond,” is designed to intuitively guide motorists through the pathways. These interchanges have been shown to increase capacity and safety, decrease congestion and minimize the cost of new infrastructure.
DDIs in Wisconsin
DDIs are being constructed at the following interchanges along I-39/90, between Beloit and Madison:
- WIS 11 (Avalon Road) interchange – opened in 2016
- WIS 26 interchange in Janesville – open in 2021
- WIS 81 interchange near Beloit – open in 2021
A DDI also opened at the WIS 441 and Oneida Street interchange in Appleton in 2018.