This leaves a total of 81 tests required. However, Waka Kotahi has also agreed to reduce the requirements for a further 30 tests.
"These 19 deferred and 30 reduced assurance tests will all be completed to the contractually agreed standards after the road opens to traffic", Waka Kotahi said.
Transmission Gully is being built through a public-private partnership (PPP), the Wellington Gateway Partnership (WGP), with CPB Contractors and HEB Construction subcontracted to carry out the design and construction.
As of yesterday, 63 of the 81 remaining safety and quality assurance tests had been accepted as meeting the required standards.
Just 18 assurance tests are outstanding, 15 of which now have reduced requirements.
The three remaining consent tasks have been submitted to Greater Wellington Regional Council for certification or confirmation.
"Waka Kotahi is not prepared to compromise on the long-term safety of the road but we are working to balance this along with the road's reliability, safeguarding the public from any future financial liability for defects not remedied now, while doing everything we can to ensure people can use this vital transport connection as soon as possible", Waka Kotahi said.
Independent inspection reports carried out last year revealed the four-lane-highway has been plagued by flawed chipseal and water seeping through the road's surface.
The chipseal defect played a significant part in the road's opening being pushed back once again just before Christmas. Originally expected to open in April 2020, the road is now expected to open this year.
Last month Waka Kotahi released photographs showing parts of the road being ripped up.
The images showed rollers doing remedial work to address the bleeding of the chipseal surface, milling and repair work, and the road being dug up to install a subsoil drain to manage water issues.