The temporary fix comes after efforts by specialist bridge engineers and fabricators to assess the damage, design the new strut, calculate and plan the repair as well as manufacture the strut itself.
The overnight fix has resulted in three lanes being opened to traffic coming from either side of the bridge from early yesterday morning.
VTNZ's roadside assistance team has not seen any increase in callouts for customers affected by lane closures on the bridge.
However, motorists were urged to stay safe on the roads and make sure they have a current Warrant of Fitness, VTNZ general manager of operations Gavin McNaught said.
It comes after it was revealed earlier this week more than 3000 vehicles on New Zealand roads are fitted with fatal, potentially deadly airbags.
Vehicles fitted with Takata Alpha airbags have been subject to a compulsory safety recall in New Zealand since April 2018.
Most motorists have replaced their airbags, but some stragglers are putting themselves and others at risk.
About 82,000 New Zealand-new and used vehicles were fitted with the airbags, a Waka Kotahi NZ Transport Agency spokesperson told the Herald.
"More than 78,000 vehicles have had their Alpha airbags replaced since the compulsory recall was announced in April 2018," the agency said.
"The remaining vehicles with Alpha airbags - 3402 as of Monday, 21 September - are unable to attain a new Warrant of Fitness [WoF] until the airbags have been replaced."