NZTA bases its figures on previous years' travel patterns, with traffic volume numbers collected from Te Pohue on SH5 and Norsewood on SH2.
Agency roading contractors are looking to complete resealing repair projects at several sites on the region's highways by the long weekend to reduce any potential disruption, highway journeys manager for Napier Oliver Postings said.
"We are heading into our main construction season," Mr Postings said.
That meant a series of preparation programmes which he said were likely to be wrapped up, weather permitting, before the long weekend.
Mr Postings said apart from bridge work on SH38 near Ohuka no roadworks were scheduled to be carried out on the region's main highways over the long weekend, although a speed restriction on the stretch leading to and across the Mohaka Bridge on SH5 remains in place as work is carried out on the inspection walkway handrails under the bridge.
"This is the walkway we use to inspect the bridge on a regular basis," Mr Postings said.
"While there may be a speed restriction over the bridge and you may not physically see anyone on site, we need to ensure that our workers are safe while working underneath the bridge deck."