G-DOT celebrated the milestone with a ribbon cutting near exit 49 in Cook County.
Officials say there's a lot of traffic that goes through the area and expanding the lanes helps provide a safer road for travels.
"So increasing that volume to three lanes on each side, that too is a safety factor so people won't be crowed traveling so close," said G-DOT Commissioner Vance Smith.
Smith adds the road construction also helped bring in jobs to people in the area.
Viewers with disabilities can get assistance accessing this station's FCC Public Inspection File by contacting the station with the information listed below. Questions or concerns relating to the accessibility of the FCC's online public file system should be directed to the FCC at 888-225-5322, 888-835-5322 (TTY), or firstname.lastname@example.org.