The green light has been given at Third Avenue in Berrinba with the new road link open to traffic.
Traffic signals were switched on at the Third Avenue and Wembley Road intersection on Monday.
Third Avenue now connects Wembley Road to the Gilmore Road roundabout.
The extension will improve traffic flow through the growing industrial zone.
The project is also expected to lessen congestion during peak hours at the nearby Berrinba East State School, as general through traffic now has the opportunity to conveniently bypass the school precinct.
Logan City Council Roads and Water Director Daryl Ross said the road extension was a huge boost for Berrinba.
“The extension of Third Avenue will ensure traffic flows are efficient and will make the suburb’s businesses more accessible and more connected,” he said.
“This road link is also a win for residents and families in the area, particularly those accessing the local school.
“Logan City Council is proud to continue delivering the infrastructure our community needs.”