A joint New South Wales Police Force and Roads and Maritime Services operation into the trucking company involved in last month's triple fatal crash at Menangle is continuing with eight trucks found with safety defects so far.
Police have found six trucks at the company's Enfield depot with evidence of speed manipulation tampering and false truck log book entries.
Officers also stopped one of the company's trucks at Marulan, on the Southern Tablelands, and allegedly discovered its speed limiter had been tampered with.
The driver of that truck was also allegedly found with cannabis. He has been charged with drug and fatigue-related offences. The man will appear at Goulburn Local Court in March.
Police stopped another truck in Albury and issued its driver with a defect notice for significant brake wear and infringement notices for not complying with oversize permits.
Meanwhile, Victoria Police found one of the company's trucks abandoned on the side of a road after its driver fled the scene. The log book was found in a nearby rubbish bin. It has been seized as evidence.
So far police have located a significant number of the fleet in NSW and interstate.
Examination of the trucks is ongoing.
Police are also examining the records and systems maintained by the company.
Yesterday's investigations signal the start of a broader chain of responsibility investigation by Roads and Maritime Services into the business practices of the company.