Illinois Department of Transportation engineers are promising a 50% improvement in traffic delays as the interminable Jane Byrne Interchange rebuild wraps up. The reconstruction ballooned from a $535 million estimate in 2013 to $806.4 million and lasted four years longer than the original 2018 completion date. A ribbon-cutting for the JBI, which connects the Eisenhower, Kennedy and Dan Ryan expressways, is set for this morning. However, four final ramps may not open until next week. See more in today’s Daily Herald.