The Jane Byrne Interchange is finally finished

• It sees about 400,000 daily commuters.

What they're saying: "For almost a decade, Illinois’ first-rate workforce worked day in and day out to entirely reconstruct this massive project," Gov. JB Pritzer said at the ribbon-cutting.

By the numbers: IDOT expects the project will cut downtown traffic delays in half.

• They say these improvements could amount to $180 million a year in savings from faster commutes and could reduce greenhouse gas emissions by an estimated 33%.

Yes, but: The project started in 2013 and was supposed to be completed in 2018 for $535.5 million.

• The latest estimate: $806.4 million
• IDOT blamed the overruns on several factors, including poor soil.

Zoom in: Improvement through the interchange include:

• 90/94 will go from three lanes to four.
• The 290 ramps will go from one lane to two.
• Adams and Jackson ramps are reopening.
• And on 90/94, some left-side ramps were switched to the right.

What's more: It wasn't just the exchange. Ten bridges over the expressway were rebuilt, with improvements for pedestrians, cyclists and nearby residents. What's next: The project is done, but some painting, landscaping and paving projects will continue through spring.

💭 Justin's thought bubble: The year this construction project started, Rahm was mayor, CPS closed 50 schools, Roger Ebert died, Jesse Jackson Jr. went to prison, and the Blackhawks won the Stanley Cup.

• Wow.