Traffic was reduced to one lane near the Lincoln Rd offramp while emergency repairs were made to a large crack in the motorway.
An investigation by the New Zealand Transport Authority revealed the crack was caused when a temporary retaining wall was removed during work the previous night.
Project services manager Andy Thackwray says fill material was added to the surface followed by a sealing layer to stop any debris or water getting through which could weaken the ground even further.
He says the area is continuing to be monitored to ensure this does not happen again.
Mr Thackwray says at peak times the Lincoln Rd interchange operates at or near capacity and drivers should pick their travel times to allow for this.
He says the number of variable message signs are being increased as the various projects along SH16 go ahead and delays warnings will be sent through radio bulletins as well as updates on NZTA's twitter account @NZTAAkl.
"Should we alter any access or routes we will advise people and alternative routes will be signposted. Last Wednesday was not a planned closure therefore the team could not implement an alternative in time."
Swanson Transport's manager Jeff Smith says NZTA are doing a good job but if there is any chance work could cause problems it should be done at night.
"At peak times it can take at least half an hour just to get along Lincoln Rd and then when you get on the motorway it can be at a stand still. I think there is light at the end of the tunnel. Once the extra lanes have been added it will be better but until then we just have to grin and bear it."
Mr Smith says the updates on traffic conditions are reasonably effective but there's not always a viable alternative route.
- © Fairfax NZ News
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