As part of routine maintenance, NorthConnex Tunnels will be closed to all traffic between 9pm and 5am from Sunday 2 May to Friday 7 May and Sunday 9 May to Friday 14 May 2021.
The tunnel will open from 5am Saturday 8 May to 9pm Sunday 9 May.
All traffic will be diverted via Pennant Hills Road to join the M1 at Wahroonga or M2 at West Pennant Hills during the closures.
Heavy vehicles will not be fined for using Pennant Hills Road during the closures.
Signage will alert road users to changes and traffic conditions.
These closures are part of routine maintenance. For the safety of workers and motorists the tunnel will be fully closed to traffic.