The first works on the revised plan for the road tunnel will start next month.
Sydney’s NorthConnex road tunnel project will move into its construction phase next month.
After more than a decade of planning, state planning minister Pru Goward signed off on the $3 billion investment last week.
The latest blueprints feature new protections against air pollution outside the twin 9km tunnels that will link the M1 and M2 motorways at Pennant Hills Road.
But residents and health professionals say they are still concerned the now higher ventilation stacks will expose locals to exhaust and pollutants.
But a spokesperson for the project says the net effect on the local community will be positive, with 5,000 trucks diverted from Pennant Hills road every day, saving 15 minutes on their journeys.
That stretch of road has also been a safety concern, with almost one collision or incident a day placing further pressure on traffic.
“NorthConnex will lead to an overall improvement in air quality for the community,” the spokesperson says.
The first works are now scheduled to take place from February, with the project due to be completed within five years.