“People driving need to be able to brake safely when lights change and this surface reduces skidding when the road is wet.
“As this sealing is temperature-dependent, it will be applied in October when the ground and air temperatures are warm enough to ensure a quality seal and permanent road markings will also be laid on the approaches to the intersection.”
NZTA said people driving might experience minor delays.
The agency warned there could be queues at peak times as people adjusted to the new lights.
The changes were necessary to allow for safer and more efficient movements into and out of Wharenui Rd and for people to safely cross the road.