This 45-mile, $1.2 billion project to expand I-39/90 in Rock and Dane counties was enumerated by the Legislature in 2011. Work has been divided into three segments – 1) Central from Janesville to Edgerton, 2) South from Janesville to Beloit, and 3) North from Edgerton to Madison.

Reconstruct the existing four-lane, divided I-39/90 and add an additional lane in each direction to create a six-lane divided freeway. The roadway would consist of three 12-foot travel lanes with 12-foot inside and outside shoulders in each direction separated by a variable-width median. Eleven interchanges within the corridor would be reconstructed to current design standards.
The project begins at the Wisconsin-Illinois state line in Rock County and continues 45.5 miles north through the U.S. Highway 12/18 interchange near Madison.
Still undetermined. The Wisconsin Department of Transportation will be including an estimated cost in an environmental impact statement that will be submitted to the Federal Highway Administration.
Current average annual daily traffic is 58,200 vehicles. This is forecast to increase 51 percent by 2030, to 87,600 vehicles/day. Heavy trucks represent approximately 30 percent of daily traffic.
There was an average of 608 crashes per year along the corridor between 2000-05.  Of these, 227 resulted in injuries and five in fatalities. Accident rates along most of the corridor exceed the statewide average for similar roadways.
Environmental Impacts
WisDOT indicates 135 acres would be impacted–111 acres of cropland and pasture, 4.4 acres of woodland and 20 acres of wetlands and other undetermined uses.
The project would be part of WisDOT’s Major Highway Program, which modernizes key travel corridors to meet congestion, safety and economic development needs.

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