The Foxground and Berry Bypass will save motorists around seven minutes when it is finished.
It is on track to open in the next few months – a year ahead of schedule, said Parliamentary Secretary for the Illawarra Gareth Ward.
To mark the progress, a community walk over the Berry Bridge is organised for June 18.
“The main feature of the Berry bypass is the 610-metre bridge, allowing motorists to bypass the Berry township completely,” Mr Ward said.
“The community has watched as this bridge has been built and it’s only fair they get a chance to walk across it before we see vehicles on it.”
Work began in January 2015, and parts of the project have already been opened.
“The Foxground bypass was completed before Easter and now we are on track to have the Berry bypass completed by mid this year, which is more than 12 months ahead of schedule,” Mr Ward said.
“When the entire upgrade is complete, motorists will save up to seven minutes in travel time through the elimination of steep climbs, sharp bends and the congestion through Berry.”