This weekend, next weekend, and possibly the weekend after, the Sydney Harbour Bridge is closed for maintenance. The road surface is being removed right back to the original concrete deck, new waterproofing is being applied to protect the steel on which the concrete rests, and then new surfacing is being applied.
There are normally 14 traffic lanes available for the Harbour crossing: 10 on the Bridge and 4 in the Harbour Tunnel. There is a bus lane available each way on the Bridge during the works which (like all bus lanes here) is available for buses, taxis, and motorcycles. All other traffic has to use the 4 lanes of the Tunnel, or take a considerable diversion.
Despite a load of advance publicity, many people tried to use their normal route, and there were big tail-backs. See this report
The great public have, of course, been complaining about the inconvenience. But I feel it is probably better to do the maintenance in a planned way rather than wait until it is unsafe and have an emergency closure. Compare and contrast the Sydney Harbour Bridge and the Hammersmith Flyover.