A power outage in the northwest of the CBD has shut down the traffic signals.
Road users are urged to be cautious and use the give way rules until the fault is fixed.
The affected streets are Airedale Pl, Chester St, Colombo St, Conference St, Cranmer Square, Dorset St, Durham St, Durham Street North, Gracefield Ave, Kilmore St, Manchester St, Montreal St, Park Tce, Peterborough St, Salisbury St, and Victoria St.