The Transport Workers' Union claims it was "fortunate" somebody wasn't killed on WA roads after more than 300 licences were issued for heavy duty trucks without proper assessment.
In January, the Department of Transport contacted the Corruption and Crime Commission because it had concerns a registered training organisation called Mines West had allegedly handed out 326 licences –some of them for road trains – despite drivers not having met the requirements of accepted driving assessment procedures.
The Department of Transport has either cancelled or is in the process of cancelling the 326 licences.
Transport Workers' Union state secretary Tim Dawson said the trucks could be turned into lethal weapons if someone behind the wheel wasn't properly trained.
"My understanding is there are people out there that could be driving that haven't been assessed properly and driving trucks, anywhere up to a road train, so it's quite worrying," he told Radio 6PR on Wednesday morning.
"It concerns our organisations and it should concern everyone out there that people could be driving vehicles out there weighing well over 100 tonnes that haven't been assessed properly and are going up and down the road.
"It's an accident waiting to happen we are properly fortunate no one has killed anyone out there."
Mr Dawson said the authorities needed to find out how long illegal licences have been handed out by Mines West and if other registered training organisations have been doing the same.
He said there needed to be more red tape put in place to ensure people getting behind the wheel of heavy duty trucks have been properly tested.
"The worse thing is, it's just another bad rogue operator...whether it be training or anybody else in this industry that gives our great industry a bad name," he said.
"We need to know how is has been allowed to go for so long... how a two bob operation like this can be out there handing out driving licences out of a Weeties pack.
"We need to make sure when people jump in a truck the people behind them have been trained properly and assessed properly and not turned into a lethal weapon."
Mr Dawson said another major concern for the union was companies were hiring people who may have not had the proper training.
"People out there are employing and believing that they have the appropriate driver's license," he said.
"They are potentially putting dangerous people in their trucks as well.
"We've all got families on the road and we want to make sure they are safe."
The Mines West website has been taken down.
Transport Minister Rita Saffioti and the Department of Transport didn't want to comment because the matter was before the CCC.