Night works will be carried out on the Baypark to Bayfair (B2B) Bay Link project site on Wednesday and Thursday.
And as significantly more people will be using the roads at Level 2, Waka Kotahi NZ Transport Agency has urged motorists to plan ahead and allow more time for journeys.
Stone columns will be tested near Te Maunga roundabout, where State Highway 2 meets State Highway 29A.
The work is scheduled to take place overnight between 8pm and 5am to minimise disruption to motorists.
There will be lane closures in place on SH2, State Highway 29A and Truman Lane, with a temporary 50km/h speed limit in place.