State Highway 1 at the Brynderwyn Hills in Northland will shut between February 26 and March 27, but reopen for six days over Easter, before closing again on April 3.
But there are fears that Northland cannot afford any more surprise closures.
It follows a stern warning from Mayor Wayne Brown about the “unjustifiable” cost and a formal directive to AT to come up with cheaper alternatives for crossings.
AT is proposing safety improvements in the Blockhouse Bay town centre that involves upgrading a pedestrian crossing, installing a new speed hump, a new bus layover area, and addressing a roundabout for buses at a tricky intersection.