It comes amid investigations into the highway's impacts on fish, streams and Porirua Harbour.
In a new report, Greater Wellington Regional Council (GWRC) said there was a billion-dollar shortfall in funding for the capital's rail network.
A rail system of this scale comes at a grand price.
Auckland Transport said the closure was necessary because of the amount of work that needed doing.
Meanwhile, there's a dark warning for Kiwis ahead of the much-anticipated mega sale.
Low cloud has blanketed the region all day long.
"Newmarket is notorious for being congested."
"We are working around the clock to get safely back into operation."
Clive Matthew-Wilson is concerned about the impacts on poorer communities.