I-39/90 Expansion Project

Illinois state line to Madison, Dane and Rock counties

WIS 26 (Milton Avenue) interchange

WisDOT is constructing a Diverging Diamond Interchange (DDI) at the I-39/90 and WIS 26 (Milton Avenue) interchange in Janesville. The new DDI is anticipated to open in fall 2021.

Why build a DDI at the I-39/90 and WIS 26 interchange?

DDIs typically perform best at locations with heavy left turn volumes, like the WIS 26 interchange in Janesville. In addition, the potential for increased safety due to a reduction in the number of conflict points at the interchange is the primary benefit of the DDI design at this location.


The following documents are in Adobe PDF PDF format.

How to Navigate the WIS 26/Milton Avenue DDI: