Engineers are assessing the damage and working on a temporary solution to reopen some centre lanes of the Auckland Harbour Bridge after a truck toppled by high winds hit a key structure.
Only the clip-on lanes on both sides of the bridge are currently open to traffic after the incident on Friday.
General manager transport services at the Transport Agency, Brett Gliddon, said one of the centre struts was damaged and it could take more than a month to replace it.
"We've got our engineers now working on it. We've got our contractors preparing, getting their resources ready. We've got manufacturers lined up to start manufacturing the strut once we're ready to go," he said.
Meanwhile as a temporary measure, engineers have been looking at using additional steel to get some load back to the damaged strut, and this process could take up to a week, according to Gliddon.
"If we're able to do that, we may be able to reopen some of the lanes in the centre span for light vehicles only. However, we've got no guarantee of that until our engineers complete their work."
Gliddon said the clip-ons are not connected to the main structure, which meant they can be used without concern.
REMINDER: Clip-on lanes remain OPEN in each direction over the Auckland Harbour Bridge (AHB). Allow additional travel time if you do plan on travelling via the bridge this weekend. Consider using the Western Ring Route (WRR): SH18, SH16 & SH20. #WeekendTraffic. ^MF pic.twitter.com/yh4ts74KXD— Waka Kotahi NZTA Auckland & Northland (@WakaKotahiAkNth) September 19, 2020
He said Auckland Transport is working over the weekend to ensure there's enough capacity for commuters but people are being asked to consider working from home or using public transport instead of travelling over the bridge.
"If they do need to travel by vehicle, we're encouraging them to use the Western Ring Route which is being designed exactly for this purpose as spare capacity across our network," he said.
"With half of the capacity out of the bridge, the rest of the network will see some congestion so people are going to have to be prepared for that and manage their travel accordingly."
Gliddon said it's the first time this has happened. He said while the cost is still unknown, it will be covered by the Transport Agency.
The Transport Agency has said it has no concerns about the overall integrity and safety of the bridge.