CHICAGO (AP) — Gov. Bruce Rauner wants lawmakers to approve a plan that would let the Illinois Department of Transportation use a public-private partnership to add lanes to a busy stretch of Interstate 55 in the Chicago area.

Rauner on Thursday announced a project that would add at least one lane to Interstate 55 in each direction between Interstate 355 and Interstate 90/94.

According to the Rauner administration the 25-miles stretch of freeway handles 170,000 vehicles a day and regularly experiences traffic slowdowns.

Rauner says the $425 million project could be paid for through tolls and be finished in 2019.

The state can enter private partnerships for freeway building and operation as long as the General Assembly approves.

Senate Republican Leader Christine Radogno joined Rauner and others in introducing a resolution seeking lawmaker approval.