"We're reminding motorists that it's still a construction site and there'll be crews working, so please be patient and take extra care through this area until all the work is finished," an NZTA spokesperson said.
"The real benefits and improvements to traffic movements through this intersection won't be realised until the intersection is completed and fully functioning in early July.
"These improvements will make it safer and easier for staff, visitors and patients to turn into and out of the hospital and is part of our commitment to improving traffic flows and safety for the growing population in this area."
NZTA has been receiving queries about the lights and people think the intersection is fully operational, which is not the case.