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.
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