Due to routine maintenance, the NorthConnex Tunnel will be closed to all traffic from 9:30pm Monday July 10 to 5am Tuesday July 11.
During the closures, all traffic will be diverted via Pennant Hills Road to join the M1 at Wahroonga or M2 at West Pennant Hills.
The National Heavy Vehicle Regulator (NHVR) says heavy vehicles will not be fined for using Pennant Hills Road during the closures.