Fatigue did not seem to be a likely cause either, as Mr Levett was not far from home and the truck driver had stopped for a break a few hours before the crash," Senior Constable Nelson said.

"It's an unusual set of circumstances."

Max's parents, brother and two neighbours suffered minor injuries and were taken to Coffs Harbour Hospital.

The truck driver and his male passenger suffered chest injuries and were also taken to the hospital.

Police said their investigations into the crash continued, but they did not believe speed was a factor.

Police from Urunga and Coffs Harbour, Ambulance Paramedics, SES volunteers, Fire and Rescue and the Crash Investigation Unit respon-ded to the incident. The Highway was closed for nine hours and light traffic diverted through Hungry Head Road and local roads in Urunga township. NSW Roads Minister, Duncan Gay, who deactivated speed cameras in July, announced on Monday that the camera at Urunga would be reactivated, but only in "warning mode" which meant speeding motorists would get a letter, not a fine. He would also install flashing speed limit signs, add warning signs, and investigate a point-to-point speed camera system. The crashes have reignited debate about the safety of the Pacific Highway, with federal Opposition Leader Tony Abbott saying he had doubts about the government's 2016 deadline to duplicate the road.

Local federal MP Luke Hartsuyker, said Urunga fatalities highlighted why the Urunga to Warrell Creek upgrade must be the next funding priority of the highway duplication.

"There is no doubt that Urunga to Warrell Creek is the worst section of road on the Pacific Highway. The statistics spell out why this section of road must be the funding priority," Mr Hartsuyker said.

"More than 25 people have lost their lives there over the past five years. At the end of 2011 we saw a fatality at Warrell Creek and we also saw a semi-trailer end up in the Nambucca River after an accident near the Macksville Bridge.

"The death of this young boy and the driver of a utility re-affirms why semi-trailers travelling through local communities is just a disaster waiting to happen."

Coffs Harbour MP, Andrew Fraser, said he had written to the Premier, Barry O'Farrell and Roads Minister, Duncan Gay, asking them to urgently convene a meeting with the relevant federal ministers to set a program and timetable for upgrading the remaining sections of the Pacific Highway to dual carriageway.

"Promises of deadlines that have not been met, and cannot be met, are not what the public wishes to hear," he said.

Mr O'Farrell, acknowledged it was a notorious stretch of road and said planning for a bypass was in progress and could start within two years. Mr O'Farrell said it could take until 2016 to complete.

Deputy Premier and Oxley MP, Andrew Stoner, said: "The incident that occurred at Urunga on the weekend was an immense tragedy that has left many of us deeply saddened, but it also steadies our resolve to achieve the Prime Minister's deadline of 2016 for duplication of the Pacific Highway."

Mayor Mark Troy said: "This is the accident many feared but never wanted to witness, our first thoughts and hopes are with the bereaved and injured”.

“Again emergency service workers, many who are volunteers, have been called to attend a horrific scene,” Mayor Troy said.

“At present I know it will be of little comfort but as recently as December Council appealed to the State and Federal Governments to allocate funding for the Raleigh to Nambucca Heads Pacific Highway upgrade,” he said.

“Council has also lobbied the State Roads Minister for the reinstatment of the speed camera near the site of this appalling tragedy. A fully laden B-Double is not easily brought under control when involved in a collision, even if the vehicle is not exceeding the speed limit, for every KPH over the limit the task becomes much more difficult."