"If they are 5km/h over the limit they will be issued a ticket. There is no tolerance for heavy motor vehicles speeding," Mr Ewers said.
Police were prepared to shift rosters so there were officers out on the highways at 4am.
"We know there are large numbers of heavy motor vehicles on our roads at 3am. These early morning shifts will become a monthly operation," Mr Ewers said.
He said it was disappointing to find heavy motor vehicles that had a number of defects that made them unsafe to be on the road. Foggy and wet weather conditions yesterday did not slow some truck drivers with two separate trucks being stopped on SH14 near Maunu for travelling 99km/h in a 70km/h zone. Another was spotted on the northern side of Smeaton's travelling 101km/h.
Some of the drivers spoken to were apologetic and realised they were in the wrong. One truck logging truck driver, with a full load, headed for Port Marsden highway failed to give way to a marked patrol car on a roundabout. A subsequent check of the load revealed it was in breach of the weight regulations.
On Tuesday a logging truck stopped at Te Kopuru, near Dargaville, was temporarily off the road after it was discovered two trailer tyres were worn down to the steel chords. The lights and indicators were not working and when weighed it was discovered the load was overweight.
A senior police commercial vehicle inspector said there would not be a week in Northland that a heavy vehicle was ordered of the road because it was unsafe.