Staff from both organisations arrived at the Redstar Transport’s site in Dubbo and a sister depot in Yennora at 6am on Friday for an operation targeting heavy vehicles.

Saturday’s accident tragically claimed the lives of two brothers, aged nine and 12, and seriously injured their four-year-old sibling.

http://www.dailyliberal.com.au/story/4644312/two-children-die-in-crash-near-dubbo-photos-video/

The boys died after the Queensland family's 4WD collided with a B-double truck on the Newell Highway, about 12 kilometres north of the Dubbo.

A third brother, aged four, was taken in a serious condition in Sydney's Westmead Children's Hospital with internal injuries.

The parents escaped with just minor injuries and were treated for shock, while the male truck driver aged in his early 50s was taken to hospital with back injuries.

The crash was so violent, the accident site stretched more than half a kilometre along the highway, with footage showing the white 4WD ripped in two on the side of the road.​

Speaking outside the Yennora depot, Traffic and Highway Patrol Commander Michael Corboy said the safety of the community was behind the investigation.

“At 6am this morning NSW Police Traffic and Highway Patrol command, with the joint traffic taskforce, attended this premises here in Yennora as part of a national audit of a truck company that was involved in a tragic fatal accident at Dubbo,” he said.

“What we need to remember here is that there was two children killed in a car accident, in the early hours of the morning, involving a B-double.

“As a result of all fatal accidents involving truck we make sure those companies involved have the right governance around their operations and ensure the community is safe to go about their way.

“In this case this company has over 160 prime movers and up to 600 trailers around Australia.

“We are currently, in conjunction with other states and in Dubbo, doing a complete audit of these depots.”