One motorist greeted the news with enthusiasm on social media, saying: "Best news to start my day with!"
All lanes on the bridge reopened following rush hour last night, after a replacement giant 22.7m strut was successfully installed on Saturday night.
"We know the last two and a half weeks have been frustrating for bridge users, especially at peak times, and we are as pleased as everyone else that we have been able to repair the damage and get it operating at full capacity much sooner than we had initially thought," said Waka Kotahi NZTA general manager transport services Brett Gliddon.
"We are grateful for the understanding and support we've had while we have worked as quickly as possible to safely repair the bridge and re-open all lanes."
Gliddon said engineers had been monitoring the new strut and its load-bearing function within the bridge superstructure over the past couple of days to see how the entire bridge was performing with the new piece in place.
"The new strut is performing well and there has been no other damage to other parts of the bridge. That means the bridge can now function with all eight lanes."
The bridge had been reduced to six lanes since September 18, when a 127km/h wind gust blew over a truck, damaging a load-bearing bridge strut.
Motorists had been forced to use alternate routes, often taking two hours to reach one side of the city to the other in peak-hour travel.