Commuters there face another week of disruption as work is now expected to be finished by March 16.
Road safety campaigner and car reviewer Clive Matthew-Wilson is among the hundreds of motorists frustrated by the daily Onewa Rd bottleneck, saying the delays impacted on commuting times and livelihoods.
"These kinds of delays have a profound economic effect. Meetings are missed, things don't get delivered," Matthew-Wilson, editor of dogandlemon.com website, said.
"Meeting contracts on a timely basis should be an essential part of the whole Auckland contract process."
Auckland Transport's website listed nearly 200 roading projects. Most were AT projects, but some were run by telcos, Watercare and power companies.
AT spokesman Mark Hannan said many factors contributed to project over-runs, citing a broken stormwater pipe crossing Onewa Rd, that caused delays.
The start and end dates on the website represented the project manager or owner's "best estimate" of when work would occur.
Some projects were behind schedule, but others had proceeded faster than expected.
Hannan said AT had received "very few complaints about overdue works" and ratepayers wouldn't be charged extra for late work completions.
"The longer the contractor takes, the more wages the contractor has to pay his workers, but he does not get any extra payment from AT."
Hannan said it was normal for contracts to specify a completion date that gives "a reasonable window" and "flexibility is often needed to work around bad weather, or to co-ordinate with other projects."
Improving Auckland's under-pressure transport system is one of the most contentious issues in Auckland Council's long-term plan to 2025.
Documents the council recently released proposed a draft budget of $6.8 billion for a "basic transport programme".
