Hot temperatures are having an impact on the roading network, with some roads showing signs of "bleeding seal" or sticky surfaces.
New Zealand Transport Agency regional transport systems manager Ross I'Anson said the road surface could become sticky when the bitumen melted and rose above the chip seal.
"Drivers may see our roadworks teams out and about laying more small chip over the top of the affected surfaces to help absorb the bitumen, and possibly water trucks spraying water on the roads," Mr I'Anson said.
He advised motorists to drive with care and patience, slow down if they see a sticky black road surface ahead and follow speed restriction signs.
"A newly surfaced road may take a little longer to settle in the very hot weather and people may encounter loose road chip and see bitumen tracking along the road.
"It is important to slow down at these sites and follow any temporary speed advisory signs. Too fast and you risk flicking sticky stone chips and damaging your vehicle as well as the newly surfaced road.
"The new road surface will settle within a few days and any minor tracking of bitumen will soon wear off with traffic."
Spots of bitumen on vehicles can be cleaned off with kerosene or baby oil.
Mr I'Anson said even areas with no work activity could require slower speeds. This could be where loose gravel has been put on the bleeding seal and is still being bedded in.
