Google live traffic data shows traffic is moving slowly between McDonald's Te Ngae and Puarenga Park through Ōwhata and Lynmore.
Google's estimated journey time on that 5.8km stretch was 35 minutes.
A screenshot of Google Maps live traffic data at 3.15pm.
NZ Transport Agency regional manager infrastructure delivery Jo Wilton said the delay was due to "surfacing works on the westbound direction on Te Ngae Road".
"There were lane closures in place earlier today to allow for placing of the structural surface layer (the layer underneath the final surface).
"The nature of the work meant we could only open lanes intermittently while completing the works, to allow traffic to flow.
"Works have been completed and all lanes are now open. It is expected that it will take another one to two hours for traffic to ease," Wilton said about 4pm.
"Motorists are asked to consider delaying their travel, where possible. We'd like to acknowledge the frustration caused and thank motorists for their patience."